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Siemens 5SY6040-6KV — Miniature Circuit Breakers (MCB)

Siemens 5SY6040-6KV SENTRON MCB, 40A B-Curve 1P+N 6kA

MPN5SY6040-6KV

Siemens SENTRON 5SY6040-6KV miniature circuit breaker, 40 A, B tripping characteristic, 1P+N, 6 kA breaking capacity per EN 60898, 230 V AC, 70 mm depth.

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

Specifications

5SY6040-6KV — Specifications
ParameterValue
Influence of the surrounding temperaturePeriodically +55°C, max. 95% humidity

Product details

The Siemens SENTRON 5SY6040-6KV is a 40 A B-curve miniature circuit breaker (MCB) in a 1P+N pole configuration, rated for 6 kA breaking capacity at 230 V AC per EN 60898.

Panel Fit & Integration

Its 70 mm installation depth matches the SENTRON compact series footprint, so it drops into existing distribution boards without reworking the gland plate or busbar stack. The ambient temperature influence is periodic up to +55°C with 95% humidity, which covers most ventilated enclosures but should be checked against the thermal derating curve if the panel runs hot.

Frequently asked questions

What is the difference between 5SY6040-6KV and 5SY6040-7?

The 5SY6040-6KV uses a B-curve tripping characteristic, while the 5SY6040-7 uses a C-curve. Both are 40 A, 1P+N, 6 kA MCBs with the same physical footprint. Choose B-curve for resistive loads and general-purpose circuits; choose C-curve for loads with higher inrush like small motors or transformers.

Will 5SY6040-6KV fit in a panel designed for 5SY6040-6?

Yes, the 5SY6040-6KV shares the same 18 mm width, 90 mm height, 70 mm installation depth, and standard DIN-rail mounting as the 5SY6040-6. It is a direct mechanical drop-in replacement.

MPN
5SY6040-6KV