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Siemens 5SN6406-8CP — 4-Pole MCB (DIN Rail)

Siemens 5SN6406-8CP MCB, 4-Pole, 6 kA (EN 60898), 30 kA (IEC

MPN5SN6406-8CP

Siemens SENTRON 5SN series MCB, 4-pole, 400 V AC, 50 Hz, 6 kA (EN 60898) / 30 kA (IEC 60947-2), 4 modular width units, 76 mm depth.

Siemens 5SN6406-8CP datasheet (PDF)
Sourced new & surplus through independent channelsAuthenticity-screened · ESD-safe packingListing updated Aug 2026

Specifications

5SN6406-8CP — Ratings
ParameterValue
Number of poles4
Rated voltage, AC (multi-phase)440 V
5SN6406-8CP — Mechanical
ParameterValue
Width in modular units4
Width72 mm
Height90 mm
Depth76 mm
Installation depth70 mm
Tightening torque, max.75 °C
Tightening torque, min.-40 °C
5SN6406-8CP — Performance
ParameterValue
Power loss per pole, AC (hot state, at In)1.6 W

Product details

The Siemens 5SN6406-8CP is a 4-pole miniature circuit breaker from the SENTRON 5SN series, designed for 400 V AC, 50 Hz supply systems. With 4 poles and a multi-phase AC rating of 440 V, it handles three-phase plus neutral switching in a single module. The 72 V DC maximum rating means it can also be used on DC control circuits up to that voltage, but the primary application is AC distribution.

The 5SN6406-8CP occupies 4 modular width units (each 18 mm wide) on a DIN rail, with a total width of 72 mm, depth of 76 mm, and installation depth of 70 mm. The 90 mm height is standard for the SENTRON 5SN family. Accepts solid conductors up to 35 mm² at the terminals, which covers most distribution cable sizes up to the breaker's current rating.

Thermal and mechanical endurance

Frequently asked questions

What is the closest functional alternative to 5SN6406-8CP?

The 5SY5416-7 is a 4-pole MCB from the same SENTRON family with the same dimensions (76 mm depth, 72 mm width, 90 mm height) and the same 400 V AC rating, but it offers a higher EN 60898 breaking capacity of 10 kA versus the 5SN's 6 kA, and it is rated for universal current (AC/DC) up to 880 V DC. It will drop into the same DIN-rail footprint without rewiring, but verify the DC rating and tripping characteristic if your application requires them.

Where can I buy 5SN6406-8CP and how is it quoted?

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

What are the key specifications of 5SN6406-8CP?

4-pole miniature circuit breaker, 400 V AC, 50 Hz, 6 kA per EN 60898 and 30 kA per IEC 60947-2, 4 modular width units, 76 mm depth, 72 mm width, 90 mm height, accepts solid conductors up to 35 mm², operating temperature range -40 °C to 75 °C.

MPN
5SN6406-8CP