The 5SM9121-6KK01: The 16 A nominal rating holds at 40 °C and 45 °C (14.88 A continuous). Above that, the unit derates stepwise: 14.4 A at 50 °C, 13.92 A at 55 °C, 13.6 A at 60 °C, 13.28 A at 65 °C, and 12.8 A at 70 °C.
Siemens 5SM9121-6KK01 SENTRON RC Unit, 16 A, 10 mA, Type A
MPN5SM9121-6KK01
Siemens SENTRON 5SM9 series RC unit, 2-pole, type A, short-time delayed, In: 16 A, 10 mA, Un AC: 400 V.
Source DocumentedChannel stated on listing & quote
Condition PhotosReal unit photos / video on request
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Worldwide DispatchDHL/FedEx — transit quoted per order
Independent China distributor & sourcing agent· Listing updated Sep 2026
Specifications
| Parameter | Value |
|---|---|
| Number of poles | 2 |
| Parameter | Value |
|---|---|
| Product designation | RC unit electronic |
| Product design / construction | Short-time delayed |
| Parameter | Value |
|---|---|
| At 40 Cel | 14.88 A |
| At 45 Cel | 14.88 A |
| At 50 Cel | 14.4 A |
| At 55 Cel | 13.92 A |
| At 60 Cel | 13.6 A |
| At 65 Cel | 13.28 A |
| At 70 Cel | 12.8 A |
| Rated value | 50 Hz |
| Type of fault current | A |
| Circuit-breaker (Design) | 5SM9 |
| Current (at AC) | 16 A |
| Supply voltage (at AC) | 230/400 V |
| Tripping residual current | 10 mA |
Product details
Frequently asked questions
Where can I buy 5SM9121-6KK01 and how do I get a price?
We source this part to order against an RFQ. Submit a request for a firm price and availability quote.
What is the at 40 °C rating for 5SM9121-6KK01?
At 40 °C the continuous current rating is 14.88 A.
What is the at 45 °C rating for 5SM9121-6KK01?
At 45 °C the continuous current rating is 14.88 A.
Will 5SM9121-6KK01 drop into a panel specified around 5SQ2360-0KA16 without rewiring?
No — the 5SQ2360-0KA16 is a 3-pole MCB with a different form factor and function (overcurrent protection only). The 5SM9121-6KK01 is a 2-pole RC unit (residual current device) with a different wiring scheme and panel footprint. They are not drop-in interchangeable.
What compliance documentation does Siemens provide for 5SM9121-6KK01?
Siemens typically supplies a declaration of conformity (CE), RoHS and REACH compliance statements, and product-specific IEC/EN test reports for SENTRON RC units. Exact documentation set is confirmed at order.
MPN
5SM9121-6KK01