ABB 1SVR405666R0000 Pluggable module varistor - UL 508

The CR-U 71 varistor module plugs into CR-U sockets, delivering fast, reliable overvoltage protection with a compact footprint. This means fewer voltage-induced trips and longer life for connected interface relays in automation panels. By isolating transient energy, it keeps processor logic stable during motor starts and grid fluctuations, reducing unscheduled downtime. The 24 V AC control supply aligns with standard automation architectures, while the 34 mm width and 9 mm depth simplify field retrofits in crowded switchgear and control cabinets. With a metal-oxide varistor, the module clamps surges at safe levels, absorbing spikes without leaking current during normal operation. The business impact is measurable: lower relay wear, improved signal integrity, and reduced nuisance resets that disrupt production lines. In practice, technicians appreciate the plug-in module’s plug-and-play installation that minimizes wiring changes and testing time, and its compatibility with CAN/CSA and IEC/EN standards speeds compliance reviews. Mechanical design emphasizes compatibility and installation efficiency. At 0.007 kg and a slim 34x24x9 mm envelope, it enables dense stacking of modules and rapid field replacements, halving downtime during maintenance windows. The pluggable approach also supports modular spare parts strategies, allowing service teams to stock few SKUs while covering multiple CR-U socket configurations across a plant. ABB builds confidence with broad certifications: UL 508 safety, CE conformity, and CSA/cURus approvals accompany the product, along with EAC and other regional declarations. This reduces qualification time for new panels and lowers procurement risk for international projects. Customers also benefit from RoHS compliance and documented DoCs, simplifying audits and customer approvals in regulated industries. Engineering teams gain confidence from readily accessible documentation: CAN/CSA, IEC/EN, and EU RoHS data, plus CAD dimensional drawings and installation manuals. The Data Sheet and manuals—along with 2D/3D CAD files—accelerate integration into electrical schematics and BOMs. In practice, this yields shorter design cycles, fewer changes during commissioning, and faster time-to-production.