Siemens 3RH1244-1BB40 Control Relay

Siemens 3RH1244-1BB40 is a SIRIUS control relay (contactor relay) in the compact S00 frame that combines four normally open and four normally closed contacts in a single module, energized by a captive 24 V DC coil and wired through screw terminals. The attachable block version is designed for panel wiring in industrial control applications where space is tight, enabling a compact solution for multi-branch control wiring. Key ratings include insulation voltage up to 690 V, pollution degree 3, surge voltage resistance of 6 kV, IP20 front protection, shock resistance of 10 g/5 ms and 5 g/10 ms, and a mechanical service life of up to 10,000,000 switching cycles, with the 24 V DC coil and screw-terminal connections ensuring durable operation. Siemens also lists a successor model, 3RH2244-1BB40, and notes that 3RH1244-1BB40 is no longer available. With eight switching contacts in a single compact package, it supports multiple discrete control paths in automation applications.