ABB 1SVR730712R1200 CM-MSS.41S Thermistor Motor Protection Relay 2 C/O 24-240V AC/DC PTC Relay

The ABB CM-MSS.41S (SKU: 1SVR730712R1200) is a relay for thermistor protection (PTC) designed to safeguard electric motors from overtemperature damage in industrial automation and control panel applications. Part of the CM-MSS series, the CM-MSS.41S features a 2 C/O (DPDT) output contact configuration and accepts a wide supply voltage range of 24–240V AC/DC, making it highly versatile for global installations. Weighing just 167 g and measuring 97 × 30 × 109 mm, it is engineered for compact DIN-rail mounting in demanding environments.

Technical Specifications

Certifications & Standards

• ATEX (Directive 94/9/EC): Approved for use in explosive atmospheres per European ATEX directive
• UKCA: UK Conformity Assessed — meets Great Britain market requirements
• DNV GL: Certified for marine and offshore applications
• CAN/CSA C22.2 No.14: Canadian Standards Association industrial control equipment standard
• EN 50495: Safety devices for explosion protection
• IEC/EN 63000: Technical documentation for RoHS compliance assessment
• IEC/EN 60079-7: Explosion-proof increased safety equipment
• IEC/EN 60947-5-1: Low-voltage switchgear — control circuit devices and switching elements
• IEC/EN 60947-8: Control units for built-in thermal protection (PTC) of rotating electrical machines
• UL 508: Industrial control equipment — UL standard for safety
• IEC 60715: DIN rail mounting dimensions for low-voltage switchgear
• EN 60079: Electrical apparatus for explosive gas atmospheres
• EN 60947-5 / EN 60947: Low-voltage switchgear and controlgear standards
• CSA C22.2 / CSA: Canadian Standards Association product certification
• REACH: EU regulation on chemical substances compliance
• RoHS: Restriction of hazardous substances in electrical and electronic equipment
• CCC: China Compulsory Certification for the Chinese market
• cULus: Dual US and Canadian UL safety certification
• CE: European conformity marking

Applications & Use Cases

• Motor overtemperature protection using PTC thermistor sensors embedded in motor windings
• Protection of pumps, compressors, fans, and conveyors in industrial automation
• Safe integration into ATEX-rated and potentially explosive environments
• Marine and offshore motor protection systems (DNV GL certified)
• Control panels requiring compact DIN-rail mounted protection relays
• Multi-voltage installations across global facilities (24–240V AC/DC universally)