{"product_id":"salus-rm-16a-16a-relay-module-for-smart-home-heating-zigbee-3-0-flush-mount-230v","title":"Salus RM-16A 16A Relay Module Smart Home Heating Zigbee 3.0 Flush Mount 230V","description":"\u003cdiv style=\"font-size: 16px; line-height: 1.6; color: #1a1a1a; max-width: 900px; margin: 0 auto; font-family: -apple-system,BlinkMacSystemFont,'Segoe UI',Roboto,sans-serif;\"\u003e\n\u003cp style=\"font-size: 17px; line-height: 1.65; margin: 0 0 18px 0;\"\u003eThe \u003cstrong\u003eSalus RM-16A\u003c\/strong\u003e is a \u003cstrong\u003ecompact 16 A relay module\u003c\/strong\u003e that extends the switching capability of Salus thermostats and wiring centres beyond their own relay ratings — rated at \u003cstrong\u003e16 A \/ 250 V AC (4,000 VA)\u003c\/strong\u003e and fitting inside a standard \u003cstrong\u003eØ60 mm flush back box\u003c\/strong\u003e or surface-mounted where no box is available. It acts as an intermediary relay: the thermostat or controller energises the RM-16A's input, and the RM-16A switches the high-current load (boiler, pump, electric UFH mat) safely.\u003c\/p\u003e\n\u003cp style=\"font-size: 17px; line-height: 1.65; margin: 0 0 22px 0;\"\u003eThe module provides three output terminals — \u003cstrong\u003eNO (normally open), COM (common) and NC (normally closed)\u003c\/strong\u003e — for both \u003cstrong\u003evoltage-free dry-contact\u003c\/strong\u003e and \u003cstrong\u003e230 V live-switching\u003c\/strong\u003e applications, covering the full range of boiler control types from standard gas boilers (which need volt-free NO\/COM) to solid-fuel boilers (which typically need NC\/COM) to direct 230 V pump and electric mat switching. In Salus iT600 \/ Smart Home systems, the RM-16A also acts as a \u003cstrong\u003eZigbee mesh repeater\u003c\/strong\u003e and can be triggered by app schedules or OneTouch automation rules.\u003c\/p\u003e\n\u003cdiv style=\"margin: 0 0 24px 0;\"\u003e\n\u003cspan style=\"display: inline-block; background: #008377CF; color: #fff; padding: 6px 14px; border-radius: 20px; font-size: 13px; font-weight: 600; margin: 0 6px 8px 0;\"\u003e16 A \/ 4000 VA\u003c\/span\u003e\u003cspan style=\"display: inline-block; background: #008377CF; color: #fff; padding: 6px 14px; border-radius: 20px; font-size: 13px; font-weight: 600; margin: 0 6px 8px 0;\"\u003eFlush Ø60 mm\u003c\/span\u003e\u003cspan style=\"display: inline-block; background: #008377CF; color: #fff; padding: 6px 14px; border-radius: 20px; font-size: 13px; font-weight: 600; margin: 0 6px 8px 0;\"\u003eNO \/ COM \/ NC Outputs\u003c\/span\u003e\u003cspan style=\"display: inline-block; background: #008377CF; color: #fff; padding: 6px 14px; border-radius: 20px; font-size: 13px; font-weight: 600; margin: 0 6px 8px 0;\"\u003eVolt-Free + 230V Input\u003c\/span\u003e\u003cspan style=\"display: inline-block; background: #008377CF; color: #fff; padding: 6px 14px; border-radius: 20px; font-size: 13px; font-weight: 600; margin: 0 6px 8px 0;\"\u003eZigbee Repeater\u003c\/span\u003e\u003cspan style=\"display: inline-block; background: #008377CF; color: #fff; padding: 6px 14px; border-radius: 20px; font-size: 13px; font-weight: 600; margin: 0 6px 8px 0;\"\u003eLED Indicator\u003c\/span\u003e\u003cspan style=\"display: inline-block; background: #008377CF; color: #fff; padding: 6px 14px; border-radius: 20px; font-size: 13px; font-weight: 600; margin: 0 6px 8px 0;\"\u003eApp \u0026amp; Schedule Control\u003c\/span\u003e\u003cspan style=\"display: inline-block; background: #008377CF; color: #fff; padding: 6px 14px; border-radius: 20px; font-size: 13px; font-weight: 600; margin: 0 6px 8px 0;\"\u003e5-Year Warranty\u003c\/span\u003e\n\u003c\/div\u003e\n\u003cdiv style=\"display: grid; grid-template-columns: repeat(auto-fit,minmax(140px,1fr)); gap: 12px; margin: 0 0 26px 0;\"\u003e\n\u003cdiv style=\"background: #f0faf9; border: 1px solid #c8e6e3; border-radius: 8px; padding: 16px 12px; text-align: center;\"\u003e\n\u003cdiv style=\"font-size: 26px; font-weight: bold; color: #005c54; line-height: 1;\"\u003e16 A\u003c\/div\u003e\n\u003cdiv style=\"font-size: 12px; color: #4a5a5a; margin-top: 6px; font-weight: 600; letter-spacing: 0.3px;\"\u003eMAX SWITCHING\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cdiv style=\"background: #f0faf9; border: 1px solid #c8e6e3; border-radius: 8px; padding: 16px 12px; text-align: center;\"\u003e\n\u003cdiv style=\"font-size: 26px; font-weight: bold; color: #005c54; line-height: 1;\"\u003e4000 VA\u003c\/div\u003e\n\u003cdiv style=\"font-size: 12px; color: #4a5a5a; margin-top: 6px; font-weight: 600; letter-spacing: 0.3px;\"\u003eMAX POWER\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cdiv style=\"background: #f0faf9; border: 1px solid #c8e6e3; border-radius: 8px; padding: 16px 12px; text-align: center;\"\u003e\n\u003cdiv style=\"font-size: 26px; font-weight: bold; color: #005c54; line-height: 1;\"\u003eØ60 mm\u003c\/div\u003e\n\u003cdiv style=\"font-size: 12px; color: #4a5a5a; margin-top: 6px; font-weight: 600; letter-spacing: 0.3px;\"\u003eFLUSH BOX SIZE\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cdiv style=\"background: #f0faf9; border: 1px solid #c8e6e3; border-radius: 8px; padding: 16px 12px; text-align: center;\"\u003e\n\u003cdiv style=\"font-size: 26px; font-weight: bold; color: #005c54; line-height: 1;\"\u003e47 × 47\u003cspan style=\"font-size: 14px;\"\u003e mm\u003c\/span\u003e\n\u003c\/div\u003e\n\u003cdiv style=\"font-size: 12px; color: #4a5a5a; margin-top: 6px; font-weight: 600; letter-spacing: 0.3px;\"\u003eMODULE SIZE\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cdiv style=\"background: #f0faf9; border: 1px solid #c8e6e3; border-radius: 8px; padding: 16px 12px; text-align: center;\"\u003e\n\u003cdiv style=\"font-size: 26px; font-weight: bold; color: #005c54; line-height: 1;\"\u003e3\u003c\/div\u003e\n\u003cdiv style=\"font-size: 12px; color: #4a5a5a; margin-top: 6px; font-weight: 600; letter-spacing: 0.3px;\"\u003eOUTPUT TERMINALS\u003c\/div\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cdiv style=\"background: #fff5f5; border-left: 4px solid #d32f2f; padding: 12px 18px; margin: 0 0 14px 0; border-radius: 4px;\"\u003e\n\u003cstrong style=\"color: #b71c1c;\"\u003eQualified installer required.\u003c\/strong\u003e \u003cspan style=\"color: #3a3a3a;\"\u003eAll mains-powered Salus Smart Home devices must be installed and commissioned by a suitably qualified and competent electrician in accordance with BS 7671 (IET Wiring Regulations). Always isolate and lock off the supply before opening any enclosure or making wiring connections.\u003c\/span\u003e\n\u003c\/div\u003e\n\u003cdiv style=\"background: #fff8e1; border-left: 4px solid #f57c00; padding: 12px 18px; margin: 0 0 14px 0; border-radius: 4px;\"\u003e\n\u003cstrong style=\"color: #e65100;\"\u003eZigbee 3.0 Smart Home version.\u003c\/strong\u003e \u003cspan style=\"color: #3a3a3a;\"\u003eThe QH listing is for the \u003cstrong\u003eZigbee 3.0 Smart Home variant\u003c\/strong\u003e of the RM-16A — capable of being controlled via the Salus Premium Lite app and acting as a Zigbee mesh repeater. A non-smart wired-only version also exists. Confirm you have a Salus UG800 or UGE600 gateway on the same network to enable app and schedule control.\u003c\/span\u003e\n\u003c\/div\u003e\n\u003cdiv style=\"background: #e6f4f3; border-left: 4px solid #008377; padding: 12px 18px; margin: 0 0 26px 0; border-radius: 4px;\"\u003e\n\u003cstrong style=\"color: #005c54;\"\u003eTypical applications.\u003c\/strong\u003e \u003cspan style=\"color: #3a3a3a;\"\u003eSolid-fuel boiler control (NC\/COM contact required); electric UFH mat switching at higher current than a thermostat relay allows; pump control; load extension when a wiring centre zone is driving more actuators than its output rating permits; volt-free interface to alarm panels, gate controllers or third-party BMS inputs.\u003c\/span\u003e\n\u003c\/div\u003e\n\u003cdiv style=\"background: #008377CF; color: #fff; padding: 12px 20px; margin: 28px 0 16px 0; border-radius: 6px; font-size: 18px; font-weight: bold; letter-spacing: 0.3px;\"\u003eKey Features\u003c\/div\u003e\n\u003cdiv style=\"display: grid; grid-template-columns: repeat(auto-fit,minmax(260px,1fr)); gap: 14px; margin: 0 0 28px 0;\"\u003e\n\u003cdiv style=\"background: #f0faf9; border: 1px solid #c8e6e3; border-radius: 8px; padding: 18px;\"\u003e\n\u003cdiv style=\"font-size: 16px; font-weight: bold; color: #005c54; padding-bottom: 6px; border-bottom: 2px solid #008377; display: inline-block; margin-bottom: 10px;\"\u003e16 A \/ 4000 VA Switching\u003c\/div\u003e\n\u003cp style=\"margin: 0; font-size: 14.5px; line-height: 1.55; color: #2a2a2a;\"\u003eHandles loads up to \u003cstrong\u003e16 A at 250 V AC (4,000 VA)\u003c\/strong\u003e — far beyond the 3–5 A relay outputs typically built into thermostats. Ideal for electric UFH mats, pumps and high-draw boiler controls that would otherwise overload the thermostat.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv style=\"background: #f0faf9; border: 1px solid #c8e6e3; border-radius: 8px; padding: 18px;\"\u003e\n\u003cdiv style=\"font-size: 16px; font-weight: bold; color: #005c54; padding-bottom: 6px; border-bottom: 2px solid #008377; display: inline-block; margin-bottom: 10px;\"\u003eNO, COM and NC Outputs\u003c\/div\u003e\n\u003cp style=\"margin: 0; font-size: 14.5px; line-height: 1.55; color: #2a2a2a;\"\u003eThree output terminals — \u003cstrong\u003eNormally Open, Common and Normally Closed\u003c\/strong\u003e — cover every boiler and device wiring requirement: gas boilers (NO\/COM), solid-fuel boilers (NC\/COM) and direct load switching for 230 V devices.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv style=\"background: #f0faf9; border: 1px solid #c8e6e3; border-radius: 8px; padding: 18px;\"\u003e\n\u003cdiv style=\"font-size: 16px; font-weight: bold; color: #005c54; padding-bottom: 6px; border-bottom: 2px solid #008377; display: inline-block; margin-bottom: 10px;\"\u003eVolt-Free and 230V Input\u003c\/div\u003e\n\u003cp style=\"margin: 0; font-size: 14.5px; line-height: 1.55; color: #2a2a2a;\"\u003eAccepts both a \u003cstrong\u003evoltage-free (dry contact) NO\/COM input\u003c\/strong\u003e and a \u003cstrong\u003e230 V switched-live (SL) input\u003c\/strong\u003e — so it bridges a thermostat with a 230 V output relay to a boiler that requires a volt-free contact, without rewiring.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv style=\"background: #f0faf9; border: 1px solid #c8e6e3; border-radius: 8px; padding: 18px;\"\u003e\n\u003cdiv style=\"font-size: 16px; font-weight: bold; color: #005c54; padding-bottom: 6px; border-bottom: 2px solid #008377; display: inline-block; margin-bottom: 10px;\"\u003eFlush Ø60 mm Installation\u003c\/div\u003e\n\u003cp style=\"margin: 0; font-size: 14.5px; line-height: 1.55; color: #2a2a2a;\"\u003eAt just \u003cstrong\u003e47 × 47 × 20 mm\u003c\/strong\u003e, the RM-16A fits neatly inside any standard Ø60 mm flush wall box — completely hidden behind a blank plate. Alternatively it can be surface-mounted using the supplied bracket.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv style=\"background: #f0faf9; border: 1px solid #c8e6e3; border-radius: 8px; padding: 18px;\"\u003e\n\u003cdiv style=\"font-size: 16px; font-weight: bold; color: #005c54; padding-bottom: 6px; border-bottom: 2px solid #008377; display: inline-block; margin-bottom: 10px;\"\u003eZigbee Mesh Repeater\u003c\/div\u003e\n\u003cp style=\"margin: 0; font-size: 14.5px; line-height: 1.55; color: #2a2a2a;\"\u003eWhen installed in the Salus iT600 \/ Smart Home Zigbee network, the mains-powered RM-16A automatically acts as a \u003cstrong\u003eZigbee signal repeater\u003c\/strong\u003e, extending mesh coverage to battery-powered devices in difficult signal areas — the same benefit as adding an RE600 repeater, at no extra device cost.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv style=\"background: #f0faf9; border: 1px solid #c8e6e3; border-radius: 8px; padding: 18px;\"\u003e\n\u003cdiv style=\"font-size: 16px; font-weight: bold; color: #005c54; padding-bottom: 6px; border-bottom: 2px solid #008377; display: inline-block; margin-bottom: 10px;\"\u003eApp Schedules \u0026amp; OneTouch Automation\u003c\/div\u003e\n\u003cp style=\"margin: 0; font-size: 14.5px; line-height: 1.55; color: #2a2a2a;\"\u003eThe Zigbee variant can be \u003cstrong\u003escheduled in the Salus Premium Lite app\u003c\/strong\u003e and triggered by \u003cstrong\u003eOneTouch rules\u003c\/strong\u003e — for example, activating a pump when a thermostat reaches a setpoint, or opening a gate relay at a defined time.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cdiv style=\"background: #008377CF; color: #fff; padding: 12px 20px; margin: 28px 0 16px 0; border-radius: 6px; font-size: 18px; font-weight: bold; letter-spacing: 0.3px;\"\u003eTechnical Specifications\u003c\/div\u003e\n\u003ctable style=\"width: 100%; border-collapse: collapse; margin: 0 0 28px 0; font-size: 14.5px;\"\u003e\n\u003ctbody\u003e\n\u003ctr style=\"background: #f0faf9;\"\u003e\n\u003ctd style=\"padding: 11px 14px; border: 1px solid #c8e6e3; font-weight: 600; width: 45%;\"\u003eManufacturer\u003c\/td\u003e\n\u003ctd style=\"padding: 11px 14px; border: 1px solid #c8e6e3;\"\u003eSALUS Controls (Computime Group)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd style=\"padding: 11px 14px; border: 1px solid #c8e6e3; font-weight: 600; width: 45%;\"\u003eModel\u003c\/td\u003e\n\u003ctd style=\"padding: 11px 14px; border: 1px solid #c8e6e3;\"\u003eRM-16A\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr style=\"background: #f0faf9;\"\u003e\n\u003ctd style=\"padding: 11px 14px; border: 1px solid #c8e6e3; font-weight: 600; width: 45%;\"\u003eType\u003c\/td\u003e\n\u003ctd style=\"padding: 11px 14px; border: 1px solid #c8e6e3;\"\u003eZigbee 3.0 flush-mount relay module\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd style=\"padding: 11px 14px; border: 1px solid #c8e6e3; font-weight: 600; width: 45%;\"\u003eMax. switching current\u003c\/td\u003e\n\u003ctd style=\"padding: 11px 14px; border: 1px solid #c8e6e3;\"\u003e16 A\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr style=\"background: #f0faf9;\"\u003e\n\u003ctd style=\"padding: 11px 14px; border: 1px solid #c8e6e3; font-weight: 600; width: 45%;\"\u003eMax. switching voltage\u003c\/td\u003e\n\u003ctd style=\"padding: 11px 14px; border: 1px solid #c8e6e3;\"\u003e250 V AC\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd style=\"padding: 11px 14px; border: 1px solid #c8e6e3; font-weight: 600; width: 45%;\"\u003eMax. switching power\u003c\/td\u003e\n\u003ctd style=\"padding: 11px 14px; border: 1px solid #c8e6e3;\"\u003e4,000 VA\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr style=\"background: #f0faf9;\"\u003e\n\u003ctd style=\"padding: 11px 14px; border: 1px solid #c8e6e3; font-weight: 600; width: 45%;\"\u003eInput options\u003c\/td\u003e\n\u003ctd style=\"padding: 11px 14px; border: 1px solid #c8e6e3;\"\u003eVoltage-free NO\/COM; 230 V AC switched-live (SL)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd style=\"padding: 11px 14px; border: 1px solid #c8e6e3; font-weight: 600; width: 45%;\"\u003eOutput terminals\u003c\/td\u003e\n\u003ctd style=\"padding: 11px 14px; border: 1px solid #c8e6e3;\"\u003eNO (normally open), COM (common), NC (normally closed)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr style=\"background: #f0faf9;\"\u003e\n\u003ctd style=\"padding: 11px 14px; border: 1px solid #c8e6e3; font-weight: 600; width: 45%;\"\u003ePower supply (module)\u003c\/td\u003e\n\u003ctd style=\"padding: 11px 14px; border: 1px solid #c8e6e3;\"\u003e230 V AC, 50 Hz (L + N)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd style=\"padding: 11px 14px; border: 1px solid #c8e6e3; font-weight: 600; width: 45%;\"\u003eLED indication\u003c\/td\u003e\n\u003ctd style=\"padding: 11px 14px; border: 1px solid #c8e6e3;\"\u003ePower and relay status\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr style=\"background: #f0faf9;\"\u003e\n\u003ctd style=\"padding: 11px 14px; border: 1px solid #c8e6e3; font-weight: 600; width: 45%;\"\u003eConnectivity\u003c\/td\u003e\n\u003ctd style=\"padding: 11px 14px; border: 1px solid #c8e6e3;\"\u003eZigbee 3.0 \/ 2.4 GHz\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd style=\"padding: 11px 14px; border: 1px solid #c8e6e3; font-weight: 600; width: 45%;\"\u003eZigbee mesh repeater\u003c\/td\u003e\n\u003ctd style=\"padding: 11px 14px; border: 1px solid #c8e6e3;\"\u003eYes — acts as mains-powered repeater\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr style=\"background: #f0faf9;\"\u003e\n\u003ctd style=\"padding: 11px 14px; border: 1px solid #c8e6e3; font-weight: 600; width: 45%;\"\u003eApp \u0026amp; scheduling\u003c\/td\u003e\n\u003ctd style=\"padding: 11px 14px; border: 1px solid #c8e6e3;\"\u003eSalus Premium Lite app; OneTouch automation\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd style=\"padding: 11px 14px; border: 1px solid #c8e6e3; font-weight: 600; width: 45%;\"\u003eMounting\u003c\/td\u003e\n\u003ctd style=\"padding: 11px 14px; border: 1px solid #c8e6e3;\"\u003eØ60 mm flush back box or surface mount\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr style=\"background: #f0faf9;\"\u003e\n\u003ctd style=\"padding: 11px 14px; border: 1px solid #c8e6e3; font-weight: 600; width: 45%;\"\u003eModule dimensions\u003c\/td\u003e\n\u003ctd style=\"padding: 11px 14px; border: 1px solid #c8e6e3;\"\u003e47 × 47 × 20 mm\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd style=\"padding: 11px 14px; border: 1px solid #c8e6e3; font-weight: 600; width: 45%;\"\u003eIndoor installation only\u003c\/td\u003e\n\u003ctd style=\"padding: 11px 14px; border: 1px solid #c8e6e3;\"\u003eYes\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr style=\"background: #f0faf9;\"\u003e\n\u003ctd style=\"padding: 11px 14px; border: 1px solid #c8e6e3; font-weight: 600; width: 45%;\"\u003eWarranty\u003c\/td\u003e\n\u003ctd style=\"padding: 11px 14px; border: 1px solid #c8e6e3;\"\u003e5 years manufacturer\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\n\u003c\/table\u003e\n\u003cdiv style=\"background: #008377CF; color: #fff; padding: 12px 20px; margin: 28px 0 16px 0; border-radius: 6px; font-size: 18px; font-weight: bold; letter-spacing: 0.3px;\"\u003eFrequently Asked Questions\u003c\/div\u003e\n\u003cdetails style=\"background: #f0faf9; border: 1px solid #c8e6e3; border-radius: 6px; padding: 14px 18px; margin: 0 0 10px 0;\"\u003e\n\u003csummary style=\"font-weight: 600; color: #005c54; cursor: pointer; font-size: 15.5px;\"\u003eWhen do I need an RM-16A in my system?\u003c\/summary\u003e\n\u003cp style=\"margin: 12px 0 0 0; font-size: 14.5px; line-height: 1.6;\"\u003eThe most common reason is that the thermostat or wiring centre relay is rated too low for the device being switched. A solid-fuel boiler needs an NC\/COM contact; a gas boiler may need a volt-free NO\/COM when the thermostat only has a 230 V live relay; an electric UFH mat may draw more than the thermostat's 3 A output; or the wiring centre is trying to drive a pump alongside multiple actuators. The RM-16A solves all of these without rewiring the thermostat or controller.\u003c\/p\u003e\n\u003c\/details\u003e\n\u003cdetails style=\"background: #f0faf9; border: 1px solid #c8e6e3; border-radius: 6px; padding: 14px 18px; margin: 0 0 10px 0;\"\u003e\n\u003csummary style=\"font-weight: 600; color: #005c54; cursor: pointer; font-size: 15.5px;\"\u003eWhat is the difference between NO and NC contacts?\u003c\/summary\u003e\n\u003cp style=\"margin: 12px 0 0 0; font-size: 14.5px; line-height: 1.6;\"\u003e\u003cstrong\u003eNO (Normally Open)\u003c\/strong\u003e: the contact is open when the relay is de-energised and closes when activated. Used for boilers and devices that should be off by default. \u003cstrong\u003eNC (Normally Closed)\u003c\/strong\u003e: the contact is closed when de-energised and opens when activated. Used for solid-fuel boilers and fail-safe devices that need to stay on unless commanded off. \u003cstrong\u003eCOM\u003c\/strong\u003e is the common terminal used with either.\u003c\/p\u003e\n\u003c\/details\u003e\n\u003cdetails style=\"background: #f0faf9; border: 1px solid #c8e6e3; border-radius: 6px; padding: 14px 18px; margin: 0 0 10px 0;\"\u003e\n\u003csummary style=\"font-weight: 600; color: #005c54; cursor: pointer; font-size: 15.5px;\"\u003eDoes it work as a repeater even when not actively switching?\u003c\/summary\u003e\n\u003cp style=\"margin: 12px 0 0 0; font-size: 14.5px; line-height: 1.6;\"\u003eYes — as a mains-powered Zigbee device the RM-16A relays Zigbee signals \u003cstrong\u003econtinuously\u003c\/strong\u003e, regardless of whether its relay output is currently active. Placing one in a corridor or between floors improves mesh reliability for battery-powered TRVs and thermostats in the same building.\u003c\/p\u003e\n\u003c\/details\u003e\n\u003cdetails style=\"background: #f0faf9; border: 1px solid #c8e6e3; border-radius: 6px; padding: 14px 18px; margin: 0 0 26px 0;\"\u003e\n\u003csummary style=\"font-weight: 600; color: #005c54; cursor: pointer; font-size: 15.5px;\"\u003eWill it fit in my existing back box?\u003c\/summary\u003e\n\u003cp style=\"margin: 12px 0 0 0; font-size: 14.5px; line-height: 1.6;\"\u003eThe module is \u003cstrong\u003e47 × 47 × 20 mm\u003c\/strong\u003e and fits in any standard \u003cstrong\u003eØ60 mm or larger\u003c\/strong\u003e circular flush back box. It can also be installed in a standard 35 mm square back box or surface-mounted with the supplied bracket. Inside the box, a blank face plate covers the installation for a clean finish.\u003c\/p\u003e\n\u003c\/details\u003e\n\u003cdiv style=\"background: #008377CF; color: #fff; padding: 16px 22px; border-radius: 6px; margin: 30px 0 0 0; text-align: center;\"\u003e\n\u003cdiv style=\"font-size: 16px; font-weight: bold; margin-bottom: 6px;\"\u003eBuild Your Salus Smart Home System\u003c\/div\u003e\n\u003cdiv style=\"font-size: 14px; opacity: 0.95;\"\u003ePair with the \u003cstrong\u003eSalus UG800 Universal Gateway\u003c\/strong\u003e, \u003cstrong\u003eTRV3RF smart radiator valves\u003c\/strong\u003e, Elypso or iT600 thermostats, the \u003cstrong\u003eRM-16A relay module\u003c\/strong\u003e and the \u003cstrong\u003eRE600 Zigbee repeater\u003c\/strong\u003e — full Salus Smart Home range available from Quality Heating.\u003c\/div\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e","brand":"Salus","offers":[{"title":"Default Title","offer_id":63454957732189,"sku":"RM-16A","price":23.0,"currency_code":"GBP","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0958\/2051\/3629\/files\/SalusRM-16A.jpg?v=1771249899","url":"https:\/\/qualityheating.co.uk\/products\/salus-rm-16a-16a-relay-module-for-smart-home-heating-zigbee-3-0-flush-mount-230v","provider":"AIZO Quality Heating","version":"1.0","type":"link"}