Side-mount auxiliary block for 3RT135/136/137
The 3RH1951-1SA11 is a SIRIUS auxiliary contact block designed to mount laterally on Siemens 3RT135, 3RT136, and 3RT137 contactors — it does not mount on the front or replace the standard contactor auxiliary stack. It provides one normally-open (NO) and one normally-closed (NC) instantaneous contact, with no leading or lagging switching contacts.
Rated current across the voltage range
At AC-15 duty (solenoid/contactor control) the rated current at 690 V is 2 A — this is the switching capacity for inductive loads at the upper end of the voltage range. The contacts are mirror-contact compliant per IEC 60947-4-1 when used with the 3RT135/136/137 contactors, meaning the NC position mechanically mirrors the NO position — critical for safety circuits where welded NO contacts must not mask an open NC.
Panel fit and wiring constraints
At 10 mm wide, 79 mm high, and 67 mm deep, this block adds minimal DIN-rail footprint — it snaps onto the contactor side without occupying additional rail space. Front protection is IP20 — finger-safe for the operator side, but the contactor assembly itself must be inside an enclosure for washdown or dusty environments.
RoHS compliance date listed as March 27, 2017 — the part meets the EU substance restrictions in effect from that date.