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Siemens 5SY3040-6KV — Miniature Circuit Breakers (MCB)

SENTRON 5SY3040-6KV Miniature Circuit Breaker, 1+N B 40A 4.5

MPN5SY3040-6KV

SENTRON miniature circuit breaker, 1+N-pole, B characteristic, 40 A rated current, 230 V AC, 4.5 kA breaking capacity, 70 mm installation depth.

Sourced new & surplus through independent channelsAuthenticity-screened · ESD-safe packingListing updated Jul 2026

Product details

The SENTRON 5SY3040-6KV is a 1+N-pole miniature circuit breaker with a B tripping characteristic, rated 40 A at 230 V AC and a breaking capacity of 4.5 kA per EN 60898. The 1+N pole design switches both line and neutral, with the neutral pole switching together with the line pole but not providing overcurrent protection on the neutral.

Installation depth is 70 mm, which matches the common depth of SENTRON distribution boards and enclosures. The neutral conductor is switched internally — no separate neutral bar needed downstream for the switched pole. Touch protection is integrated per the product feature, so no additional finger-safe covers are required on the terminals in a properly enclosed panel.

Frequently asked questions

Where can I buy the 5SY3040-6KV and get a price?

This part is sourced and quoted to order against an RFQ through independent distribution. Availability and current pricing are confirmed at quote time — submit an RFQ for the exact commercial terms.

What is the closest functional second-source to the 5SY3040-6KV?

The closest functional peer within the SENTRON family is the 5SY6040-6, which shares the same 1+N pole configuration, 40 A rating, and 6 kA breaking capacity, but uses a C tripping characteristic instead of B. The mechanical dimensions (18 mm width, 70 mm installation depth) are identical, so it drops into the same panel footprint without rewiring — the difference is the trip curve, not the fit.

Will the 5SY3040-6KV drop into a panel specified around the 5SY6006-7?

The 5SY6006-7 is also a 1+N-pole SENTRON MCB on a standard DIN rail with 70 mm installation depth, so the 5SY3040-6KV shares the same footprint and mounting. The critical difference is the rating: the 5SY6006-7 is a 6 A C-curve device, while the 5SY3040-6KV is a 40 A B-curve device. The panel busbar and downstream cable sizing must be rated for 40 A — the mechanical fit is fine, but the electrical upgrade is substantial.

MPN
5SY3040-6KV