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Siemens 5SJ3663-7 — Miniature Circuit Breakers (MCB)

Siemens 5SJ3663-7 SENTRON MCB, 63A C-Curve 4.5kA 3P+N

MPN5SJ3663-7

Siemens SENTRON 5SJ3 series miniature circuit breaker, 5SJ3663-7, 3P+N, 63 A, C characteristic, 4.5 kA breaking capacity at 400 V AC.

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

5SJ3663-7 — Ratings
ParameterValue
Overvoltage category3

Product details

63 A C-curve MCB for 400 V AC distribution

The Siemens SENTRON 5SJ3663-7 is a 4-pole miniature circuit breaker (3P+N) rated at 63 A with a C tripping characteristic, breaking 4.5 kA at 400 V AC per EN 60898 and IEC 60947-2.

Conductor termination and environmental range

Sealable terminals (yes) and touch protection built in, so a panel builder can wire it and close the cover without exposed live parts. Ambient temperature range spans -40 to +75 °C (operating -20 to +45 °C), with periodic tolerance to +55 °C at 95% humidity — relevant if the panel sits near a washdown zone or in an unconditioned warehouse mezzanine. Vibration resistance tested to 50 m/s² at 25–150 Hz and 60 m/s² at 10–150 Hz per IEC 60068-2-6, so it holds up on a machine frame or in a mobile substation.

Frequently asked questions

Where can I buy the 5SJ3663-7 and get a price?

Sourced and quoted to order against an RFQ through independent distribution. Availability and current pricing are confirmed at quote time — submit an RFQ for a firm price and lead time.

What is the solid and stranded conductor range for 5SJ3663-7?

Both solid and stranded conductors from 0.75 mm² up to 25 mm² are accepted, matching the 63 A rating without needing pin reducers.

How does the 5SJ3663-7 compare to the 5SQ2670-2YA16?

The 5SQ2670-2YA16 is a 4-pole SENTRON 5SQ series MCB rated 16 A with a 3 kA breaking capacity and 55 mm installation depth. The 5SJ3663-7 carries 63 A, 4.5 kA, and 70 mm depth — it is a higher-current, higher-fault-rated breaker. They share the same 400 V AC voltage class and C-curve, but the 5SQ is a lighter-duty design; the 5SJ3663-7 is the correct choice for a 63 A feeder or motor branch.

MPN
5SJ3663-7