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Siemens 5SJ4308-7HG42 — 3-Pole MCB (DIN Rail)

Siemens SENTRON 5SJ4308-7HG42 MCB, 3P, 8A, C-Curve, 70mm Dep

MPN5SJ4308-7HG42
Active

Siemens SENTRON 5SJ4 series, miniature circuit breaker, 3-pole, 8 A rated, C characteristic, 70 mm depth, 54 mm width, 121 mm height.

$129.54Ref. price · indicative, final on quote
Sourced new & surplus through independent channelsAuthenticity-screened · ESD-safe packingListing updated Aug 2026

Specifications

5SJ4308-7HG42 — Identification
ParameterValue
Brand nameSENTRON
Number of poles3
Pole configuration3P
Suitability for operationMechanical engineering / industry
5SJ4308-7HG42 — Protection
ParameterValue
Tripping characteristic (curve)C
Overvoltage category3
IP protection classIP20, with connected conductors, IP 40 in the handle range
Pollution degree3
5SJ4308-7HG42 — Electrical
ParameterValue
Rated current (AC)8 A
Neutral conductor switchingNo
5SJ4308-7HG42 — Mechanical
ParameterValue
Modular width units3
Mounting positionany
Width54 mm
Height121 mm
Depth70 mm
Installation depth70 mm
Terminal tightening torque, max.75 °C
Terminal tightening torque, min.-40 °C
Combined terminal, topYes
Combined terminal, bottomYes
Fastening methodon standard mounting rail
SealableYes
5SJ4308-7HG42 — Environmental
ParameterValue
Halogen-freeYes
Silicone-freeYes

Product details

It is designed for snap-on mounting on standard DIN rails in any position, fitting into a 70 mm deep enclosure.

At 30 °C and 40 °C the breaker holds its full 8 A rating. At 45 °C it derates to 7.8 A, at 50 °C to 7.6 A, and at 60 °C to 7.2 A. The maximum ambient is 75 °C; minimum storage is -40 °C.

Mounting and Environment

Snaps onto standard mounting rail, any orientation. The IP rating is IP20 with connected conductors, IP40 in the handle area — fine for a dry indoor panel, not for washdown zones. Vibration resistance is 50 m/s² at 25 to 150 Hz and 60 m/s² at 35 Hz (4 s), so it holds up on a machine frame or conveyor line. Terminal tightening torque is 3.5 Nm for copper conductors.

Frequently asked questions

What is the rated current and trip curve of 5SJ4308-7HG42?

The breaker is rated 8 A at AC, with a C tripping characteristic (5–10x In).

What are the mounting dimensions of 5SJ4308-7HG42?

Depth is 70 mm, width is 54 mm, height is 121 mm. It occupies 3 modular width units on a DIN rail.

Where can I buy 5SJ4308-7HG42?

This part is sourced and quoted to order against an RFQ through independent distribution. Availability and current pricing are confirmed at quote time.

MPN
5SJ4308-7HG42