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Siemens 5SJ3650-7 — Miniature Circuit Breakers (MCB)

Siemens 5SJ3650-7 SENTRON MCB, 4-Pole C-Curve 50A 4.5kA

MPN5SJ3650-7

Siemens SENTRON 5SJ3 series, miniature circuit breaker 5SJ3650-7, 4-pole (3P+N), C-curve, 50 A rated current, 4.5 kA breaking capacity, 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

5SJ3650-7 — Ratings
ParameterValue
Overvoltage category3

Product details

The Siemens 5SJ3650-7 is a SENTRON 5SJ3 miniature circuit breaker — 4-pole (3P+N), C-curve, rated 50 A at 400 V AC with a 4.5 kA breaking capacity certified to both EN 60898 and IEC 60947-2. That 4.5 kA figure is the fault-clearing limit it holds the unit on the grid through; anything beyond that and the upstream device needs to coordinate.

Terminal and wiring

The unit is sealable — a lead seal can be fitted over the terminal cover to prevent tamper after commissioning, a common requirement on utility-metered or safety-critical supplies.

Ambient range is -20 to +45 °C operating, with a storage range of -40 to +75 °C. Mechanical life is 20 000 switching cycles — that is the handle mechanism, not the electrical endurance under fault, but it gives a sense of the build quality for routine isolation duty.

Frequently asked questions

What is the breaking capacity of the 5SJ3650-7?

Rated breaking capacity is 4.5 kA per both EN 60898 and IEC 60947-2 at 400 V AC. That is the maximum prospective fault current the breaker can safely interrupt; verify coordination with the upstream protective device if the available fault current at the panel exceeds this figure.

What wire sizes does the 5SJ3650-7 accept?

Terminals accept solid or stranded copper from 0.75 mm² up to 25 mm². That covers control wiring through to the main 50 A feeder conductor.

Where can I buy the 5SJ3650-7 and get a price?

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

Will the 5SJ3650-7 drop into a panel specified for the 5SJ6463-7 without rewiring?

Not without checking the terminal range. The 5SJ6463-7 accepts a maximum of 2.5 mm² (solid/stranded), while the 5SJ3650-7 accepts up to 25 mm² — the same physical DIN footprint (4 width units, 70 mm depth) and similar pole count, but the 5SJ6463-7 is a 63 A device with a 6 kA breaking capacity. If the existing wiring is sized for 63 A (e.g., 10 mm² or larger), the 5SJ3650-7's terminals will handle it; if the panel was wired with smaller tails for a 50 A load, the 5SJ6463-7's 2.5 mm² limit may be undersized. Verify the conductor size before swapping.

MPN
5SJ3650-7