The Siemens 3RQ4901-0C is an 8-pole connecting comb from the SIRIUS 3RQ4 family, designed for coupling relays in the narrow housing format. It bridges identical potentials across adjacent relay positions, with a maximum infeed current of 10 A. This is the accessory that turns individual relay bases into a common potential rail — critical for reducing wiring in multi-relay control schemes.
Mounts directly onto the SIRIUS 3RQ4 narrow coupling relay bases. The 8-pole comb spans eight adjacent relay positions, so it's sized for a standard row in a control panel. Panel builders use this to distribute a common supply voltage (e.g. 24 VDC) or a common signal return across multiple relays without daisy-chaining individual wires. Package dimensions are 95 x 93 x 65 mm — fits within the DIN-rail footprint of the relay assembly.