Skip to main content
Log in
Siemens 5SJ6425-6 — 4-Pole MCB (DIN Rail)

Siemens 5SJ6425-6 SENTRON MCB, 4-Pole B 25A 6kA 400V

MPN5SJ6425-6

Siemens SENTRON 5SJ6 miniature circuit breaker, 4-pole, B-curve, 25 A, 6 kA breaking capacity per IEC 60898, 400 V AC, 70 mm installation depth.

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

Specifications

5SJ6425-6 — Identification
ParameterValue
Type / order code5SJ6
Brand nameSENTRON
5SJ6425-6 — Ratings
ParameterValue
Number of poles4
Pole configuration4
Rated current (In), AC25 A
Rated voltage, DC (max.)60 V
Voltage typeAC/DC
Rated frequency50 Hz
5SJ6425-6 — Protection
ParameterValue
Tripping characteristic (trip curve)B
Rated breaking capacity (Icn), per EN 608986 kA
Rated breaking capacity, per IEC 60947-26 kA
Overvoltage category3
Degree of protection (IP)IP20, with connected conductors
Touch protectionYes
5SJ6425-6 — Mechanical
ParameterValue
Width in modular units4
Installation depth70 mm
Mounting positionany
SealableYes
5SJ6425-6 — Environmental
ParameterValue
Halogen-freeYes
Silicone-freeYes
Influence of ambient temperature (derating)Periodically +55°C, max. 95% humidity
5SJ6425-6 — Performance
ParameterValue
Mechanical service life (switching cycles, typ.)20 000

Product details

What this 4-pole B-curve 25 A MCB delivers

The Siemens 5SJ6425-6 is a SENTRON 5SJ6 miniature circuit breaker rated 25 A at 400 V AC, 4-pole, with a B-curve tripping characteristic and 6 kA breaking capacity per EN 60898 and IEC 60947-2. Terminal capacity accepts solid or stranded conductors from 0.75 up to 25 mm², covering most distribution cable sizes up to 6 mm² tails and 16 mm² feeders.

Installation depth is 70 mm — verify enclosure depth against the back panel clearance, especially with gland plates or busbar systems behind the rail. The 4 width units (roughly 72 mm at 18 mm per unit) occupy the same footprint as any 4-pole 5SJ6 MCB; swapping a 2-pole unit like the 5SJ6220-6 would require a different rail layout and busbar arrangement. Sealable terminals (yes) allow panel builders to lock the cover after wiring — useful for installations requiring tamper-evident metering or utility isolation. Touch protection is integrated per the listing.

Frequently asked questions

What is the breaking capacity of 5SJ6425-6?

6 kA per both EN 60898 and IEC 60947-2 at 400 V AC. That is the standard breaking capacity for this SENTRON 5SJ6 series — sufficient for most sub-distribution boards where the prospective short-circuit current is under 6 kA.

Will 5SJ6425-6 drop into a panel wired for 5SJ6220-6?

No — the 5SJ6220-6 is a 2-pole unit occupying 2 width units, while the 5SJ6425-6 is 4-pole occupying 4 width units. The physical footprint and pole count are different; the panel would need rewiring and a different DIN-rail layout.

What wire sizes does 5SJ6425-6 accept?

Solid or stranded conductors from 0.75 mm² up to 25 mm². That covers standard distribution wiring up to 16 mm² feeders and 6 mm² branch circuits.

Where can I buy 5SJ6425-6 and how is it quoted?

Sourced and quoted to order against an RFQ through independent distribution. Availability and current pricing are confirmed at quote time — no stock figures or lead-time numbers are published here.

MPN
5SJ6425-6