Atmoce MR100‑S Single Phase Safety Relay – Secure Grid Disconnection for Solar & Backup Systems

The Atmoce MR100‑S is a DIN rail mount M Relay designed for single phase installations, providing a reliable and compliant grid isolation solution for solar photovoltaic and battery backup systems. Engineered for both domestic and commercial use, it offers automatic or remote controlled disconnection between the PV or storage system and the grid, enhancing safety, optimising export control, and supporting local regulation.

Why buy the Atmoce MR100‑S?

• Enhanced electrical safety: Acts as a robust physical disconnect, ensuring safe isolation of the grid from your PV or storage installation during maintenance, faults, or emergency shutdowns.
• Smart energy management: Integrates seamlessly with Atmoce M‑Gateway and compatible controllers, enabling automatic grid tie on/off cycles based on tariffs, battery state of charge, or local grid code requirements.
• Reliable single phase performance: Rated up to 40 A at 230 V, the MR100‑S is well matched to typical residential and light commercial single phase systems, reducing the risk of overload and supporting long term operation.
• Simple, DIN rail installation: Compact design with standard DIN rail mounting suits modern distribution boards and combiners, speeding up installation for both electricians and solar installers.
• Low power, low noise operation: Features minimal night time power consumption and low acoustic noise, making it suitable for domestic environments where noise and vampire draw are a concern.

Suitable for

• Single phase residential solar PV systems.
• Single phase battery backup and hybrid installations.
• Connection boxes or combiners where grid disconnection is required for safety or regulatory compliance.
• Projects needing remote or time of use control of grid‑tie status (e.g. night time is landing or feed in limit scenarios).

Key features

• Single‑phase 230 V, 40 A grid‑protection relay for L-N operation.
• Auto disconnect and re engage function, supporting safe grid separation and automatic re connection.
• RS485 interface for integration with monitoring and control gateways.
• DIN rail mounting (35 x 7.5 mm punched rail) for easy installation in distribution boards and combiners.
• LED status indicator for clear visual feedback of relay state.
• IP20 protection rating for indoor use in dry, dust free environments.
• Low night power consumption and low operating noise for homes and offices.
• Designed to meet relevant low voltage and electromagnetic compatibility standards for grid connected equipment.

Technical specifications