Siemens 3RU2136-4JB0: a 3RU2 thermal overload relay in size S2 with a setting range of 54 … 65 A and CLASS 10 tripping, built for contactor mounting. It has 1 NO + 1 NC auxiliary contacts: the NC contact opens the contactor coil circuit on overload and the NO contact can signal the trip to the PLC.
A relay that trips repeatedly is often a sign of a mechanical problem or phase loss, but bimetal relays also age; replacing an old relay with a new one of the same range is a common maintenance task.
See our Siemens industrial controls for matching 3RT2 contactors in size S2.
Technical data
| Siemens order number | 3RU2136-4JB0 |
|---|---|
| Product | SIRIUS 3RU2 thermal overload relay |
| Size | S2 |
| Current setting range | 54 … 65 A |
| Trip class | CLASS 10 |
| Auxiliary contacts | 1 NO + 1 NC |
| Rated operating voltage | 690 V |
| Motor power at 400 V (approx.) | 30 kW |
| Mounting | Contactor mounting (size S2) |
| FLA, 3-phase motor at 480 V (UL) | 65 A |
| Power loss (hot, total) | 15.6 W |
| Ambient temperature (operation) | -40 … +70 °C |
| Dimensions (W x H x D) | 55 x 90 x 105 mm |
| Net weight | 0.322 kg |
| Condition | New, original Siemens |
Typical applications
- Protection of motors with rated current 54 … 65 A
- Motor starters with SIRIUS 3RT2 contactors
- Pumps, fans and conveyors in water, HVAC and packaging plants
- Replacement of an aged or damaged overload relay
Compatibility and replacement
Plugs directly onto 3RT2 contactors of size S2 (3RT203x). For separate (stand-alone) mounting Siemens offers a terminal support. If the motor current is at the top of the range, choose the next range up so the setting sits in the middle of the scale.
Frequently asked questions
What does CLASS 10 mean?
The trip class per IEC 60947-4-1: at 7.2 times the setting current the relay trips within 4 to 10 seconds, which suits motors with normal starting.
Manual or automatic reset?
The data sheet title lists manual-automatic reset; the mode is selected on the relay front.
What is the UL full-load current rating?
Per Siemens: 65 A for a 3-phase motor at 480 V.
How fast can you deliver, and is there a warranty?
Air shipping usually takes 5 to 7 days once the part is ready, to almost any country. Each part is new and original with a 1-year warranty. Message us on WhatsApp with the order number for a quotation.
How to order
Message us the order number and quantity. For breakdowns, tell us the delivery address and we will offer the fastest shipping option. If the exact part is discontinued, we confirm the official successor before quoting.
RendatSP ships from Yiwu, China, to factories worldwide; air delivery usually takes 5 to 7 days once the part is ready. The part is new and original with a 1-year warranty (shipping, payment and warranty). For a quotation, message us on WhatsApp with the order number and quantity. We also have agents in Saudi Arabia, Iraq, the UAE, Egypt, Oman, Libya, Morocco, Mauritania, Yemen, Algeria and Jordan.
