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Siemens 5SP4291-8 — 2-Pole MCB (DIN Rail)

Siemens 5SP4291-8 SENTRON MCB, D Curve, 100 A, 2-Pole, 400 V

MPN5SP4291-8
Active

Siemens SENTRON 5SP series miniature circuit breaker, 2-pole, D characteristic, 100 A rated at 400 V AC, 10 kA breaking capacity per EN 60898, 3 modular width units, DIN rail and screw fixing.

$114.30Ref. price · indicative, final on quote
Siemens 5SP4291-8 datasheet (PDF)
Sourced new & surplus through independent channelsAuthenticity-screened · ESD-safe packingListing updated Aug 2026

Specifications

5SP4291-8 — Identification
ParameterValue
Product designationMiniature circuit breaker
Brand nameSENTRON
5SP4291-8 — Electrical
ParameterValue
Number of poles2
5SP4291-8 — Protection
ParameterValue
Tripping characteristic classD
Overvoltage category3
5SP4291-8 — Mechanical
ParameterValue
Modular width units3
Width54 mm
Height90 mm
Depth76 mm
Installation depth70 mm
Mounting positionany
Min.-40 °C
Max.75 °C
Protection degree (IP)IP20 with connected conductors, IP40 in the area of the handle with distribution cover
5SP4291-8 — Environmental
ParameterValue
Pollution degree3

Product details

The Siemens SENTRON 5SP4291-8 is a 2-pole miniature circuit breaker with a D tripping characteristic, rated 100 A at 400 V AC and 10 kA breaking capacity per EN 60898.

Ratings that matter for fit

The 100 A rating holds at 30 °C ambient; derate to 95 A at 40 °C, 89.5 A at 50 °C, and 84 A at 60 °C — important when the breaker shares a crowded enclosure with other heat sources. Multi-phase operation is rated at 440 V AC, giving headroom for 400 V line-to-line systems.

Fastens via DIN rail or screw fixing — both options on the same housing. Mounting position any, so vertical or horizontal busbar runs both work. Tunnel terminals top and bottom accept conductors without ferrules. Touch protection is built in. Sealable cover available for tamper-proofing.

Frequently asked questions

Where can I buy 5SP4291-8?

Sourced and quoted to order against an RFQ through independent distribution; availability and current pricing confirmed at quote time.

What is the closest functional second-source to 5SP4291-8?

The 5SP4292-7 is a peer in the same SENTRON 5SP family — same D curve, same pole count, same form factor — but check its rated current and breaking capacity against your load. The 5SP4291-8 carries 100 A at 400 V AC with 10 kA per EN 60898.

Will 5SP4291-8 drop into a panel specified around 5SP4292-7 without rewiring?

Yes — both are 2-pole, 3-modular-width (54 mm) DIN-rail breakers from the same SENTRON 5SP series, so the footprint and busbar pitch are identical. No rewiring needed if the current and breaking capacity match your circuit.

What compliance documentation does Siemens provide for 5SP4291-8?

The breaker is designed to EN 60898 and IEC 81346-2 (designation FC). It is halogen-free and silicon-free. Specific RoHS, REACH, UL, or IEC certificates should be requested with the RFQ — the evidence does not list them directly.

MPN
5SP4291-8