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Siemens 5SM3748-0 — Residual Current Breakers (RCCB/RCBO)

SENTRON 5SM3748-0 RCCB, 4-pole, Type AC, 100 A, 500 mA

MPN5SM3748-0

SENTRON 5SM3748-0 RCCB, 4-pole, type AC, In 100 A, 500 mA, Un AC 400 V, instantaneous.

Source DocumentedChannel stated on listing & quote
Condition PhotosReal unit photos / video on request
WhatsApp AnswersFast human replies for machine-down parts
Worldwide DispatchDHL/FedEx — transit quoted per order
Independent China distributor & sourcing agent· Listing updated Sep 2026

Specifications

5SM3748-0 — Electrical Ratings
ParameterValue
Number of poles4
5SM3748-0 — Identification
ParameterValue
Product designationRCCB
Product design / constructionInstantaneous
5SM3748-0 — Other specifications
ParameterValue
At AC100 A
Residual current typeAC
Tripping fault current500 mA
Supply voltage frequency50 Hz

Product details

The SENTRON 5SM3748-0 is a 4-pole residual current operated circuit breaker (RCCB), type AC, rated 100 A at 400 V AC with a 500 mA tripping fault current. It is an instantaneous design, meaning it trips without a time delay when the residual current exceeds 500 mA. This covers the basic earth-leakage protection requirement for a 4-wire (3-phase + neutral) supply in a distribution board.

The 500 mA residual current trip threshold is higher than the standard 30 mA used for personal shock protection; it is typically specified for equipment protection or where high leakage from filters or drives would nuisance-trip a lower-sensitivity device. The 4-pole configuration switches all three phases and the neutral, so it fits a 3P+N distribution board without a separate neutral link.

Frequently asked questions

Where can I buy 5SM3748-0 and how do I get a price?

The part is available to order through independent distribution. Submit an RFQ for current pricing and availability confirmation.

When sourcing 5SM3748-0, what's the closest functional second-source — 5SQ2670-2YA16?

The 5SQ2670-2YA16 is a 4-pole MCB (miniature circuit breaker), not an RCCB. It provides overcurrent protection (16 A, C-curve, 3 kA breaking capacity) but no residual current protection. The 5SM3748-0 serves a different function: earth-leakage detection. They are not drop-in substitutes and serve different roles in a panel.

What is 5SM3748-0's listed number of poles (4) on this component line?

The 5SM3748-0 is a 4-pole device, switching all three phases and neutral.

What compliance documentation does this brand provide for 5SM3748-0 (RoHS, REACH, UL, IEC)?

As a SENTRON product, the 5SM3748-0 is designed and tested to applicable IEC standards for RCCBs. Specific documentation (RoHS, REACH, UL) should be confirmed at time of order; the manufacturer typically provides declarations on request.

MPN
5SM3748-0