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Siemens 5SJ4120-8HG40 — 1-Pole MCB (DIN Rail)

Siemens 5SJ4120-8HG40 SENTRON MCB, 1-pole D 20 A, 240 V

MPN5SJ4120-8HG40

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Siemens SENTRON 5SJ4120-8HG40 miniature circuit breaker, 1-pole, D-curve, 20 A, 240 V, 14 kA interrupting capacity per UL 489, 70 mm depth, 18 mm width.

$30.48 – $76.73Ref. price · indicative, final on quote

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Siemens 5SJ4120-8HG40 datasheet (PDF)

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

Specifications

5SJ4120-8HG40 — Identification
Parameter	Value
Product designation	Miniature circuit breakers
Brand name	SENTRON
Number of poles	1
Application suitability	Mechanical engineering / industry

5SJ4120-8HG40 — Electrical & Protection
Parameter	Value
Tripping characteristic class	D
Overvoltage category	3

5SJ4120-8HG40 — Mounting & Connection
Parameter	Value
Mounting position	any
Fastening method	on standard mounting rail
Combined terminal, top	Yes
Combined terminal, bottom	Yes
Width	18 mm
Height	90 mm
Depth	70 mm
Installation depth	70 mm
Modular width units	1
Torque, min.	-40 °C
Torque, max.	75 °C
Sealable	Yes

5SJ4120-8HG40 — Environmental
Parameter	Value
IP protection class	IP20, with connected conductors, IP 40 in the handle range
Pollution degree	3
Halogen-free	Yes
Silicone-free	Yes

Product details

The 5SJ4120-8HG40: At 20 A, the breaker clears a 14 kA fault at 240 V without upstream cascading, which is the interrupting rating required for many industrial panelboard and branch-circuit applications under UL 489.

Physical fit and mounting

Mounting position is any orientation; the housing is rated IP20 with connected conductors and IP40 in the handle area, suitable for enclosed panel environments.

UL 489 listed for branch-circuit protection in North America; the product also carries IEC/EN 60898-1 and IEC/EN 60947-2 certifications for global use.