24 V DC control — 6 A switching capacity for auxiliary circuits
The 3RH6122-1BB40: The coil is rated for 24 V DC control supply voltage, the standard rail voltage in PLC-driven panels. The closing and holding power of the magnet coil is 4 W DC, which defines the load on the 24 V DC power supply — budget 4 W per relay for sizing the PSU.
2 NO + 2 NC auxiliary contacts — 22 E switching element identification
The auxiliary contact configuration is 2 normally-open and 2 normally-closed contacts, identified by the switching element code 22 E. For the wireman, the terminal capacity covers common control wiring sizes up to 4 mm², and the screw clamp provides a vibration-resistant connection.
DIN-rail footprint — 45 mm width, 73 mm depth, size S00 frame
The width is 45 mm, depth 73 mm, height 57.5 mm, and the frame size is S00 — the smallest Siemens contactor frame. For a field service tech replacing a failed relay, the 45 mm width occupies one standard DIN-rail slot, and the 73 mm depth fits most 80 mm deep enclosures without interference with the gland plate.
Environmental and compliance — RoHS, altitude, temperature range
The substance prohibitance date is 05/01/2012, confirming RoHS compliance per EU Directive 2011/65/EU. Installation altitude is limited to 2000 m above sea level — above this, dielectric strength and cooling derate. Surge voltage resistance is 6 kV, per IEC 60947-1 overvoltage category. For a quality documentation controller, these figures support the technical file for CE marking and panel certification.