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Siemens 5SY6340-6CC — 3-Pole MCB (DIN Rail)

Siemens 5SY6340-6CC SENTRON MCB, 3P B-Curve 40A 400V AC

MPN5SY6340-6CC

Siemens SENTRON 5SY6340-6CC, 3-pole miniature circuit breaker, B-curve, 40 A rated current, 400 V AC, 6 kA breaking capacity per EN 60898, 3 modular units wide.

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

Specifications

5SY6340-6CC — Identification
ParameterValue
Design / model code5SY6CC
Brand nameSENTRON
Number of poles3
Suitability for operationMechanical engineering / industry
5SY6340-6CC — Protection
ParameterValue
Tripping characteristic (curve)B
Breaking capacity per EN 608986 kA
Overvoltage categoryIII
IP protection classIP20, with connected conductors
Energy limitation class3
Pollution degree3
5SY6340-6CC — Electrical
ParameterValue
Rated voltage (AC, multi-phase)440 V
Rated frequency50/60 Hz
5SY6340-6CC — Mechanical
ParameterValue
Modular width units3
Mounting positionany
Width54 mm
Height90 mm
Depth76 mm
Installation depth70 mm
Terminal tightening torque, max.75 °C
Terminal tightening torque, min.-40 °C
Combined terminal, topYes
Combined terminal, bottomYes
Fastening methodQuick assembly system
SealableYes
5SY6340-6CC — Environmental
ParameterValue
Halogen-freeYes
Silicone-freeYes
Influence of surrounding temperaturemax. 95% to 55°C, max. 55% to 70°C, max. 35% to 75°C

Product details

It carries a 6 kA breaking capacity per EN 60898 and a 5 kA rating per UL 1077 / CSA C22.2 No.235, so it handles standard branch-circuit protection in North American and IEC panels alike.

At 400 V AC it clears faults up to 6 kA (EN 60898); for UL-listed panels the interrupting rating is 5 kA (UL 1077). That covers most commercial and light-industrial distribution boards, but not high-fault locations like utility tie points. It also carries a 72 V DC rating, so it can serve DC control circuits or small solar combiner boxes at that voltage, though the DC breaking capacity isn't separately stated — treat it as a supplementary protector for DC loads. The 3-module width (54 mm) and 76 mm depth fit standard DIN-rail enclosures; the quick-assembly fastening method and any-position mounting simplify panel layout.

Deployment context

Rated for mechanical engineering and industry per the manufacturer's suitability code. Combined top and bottom terminals allow feed-through wiring without extra busbars.

Frequently asked questions

What is the closest functional second-source for 5SY6340-6CC?

The 5SY7140-8CC is a peer in the same SENTRON family but carries a C-curve characteristic (5–10x In magnetic trip) versus the B-curve of the 5SY6340-6CC. For a direct drop-in without rewiring, stick with a B-curve 3-pole 40 A MCB in the same 3-module footprint; the 5SY7140-8CC would trip differently on inrush and may nuisance-trip on some loads.

What compliance documentation does this brand provide for 5SY6340-6CC?

The part carries approvals per EN 60898 (6 kA) and UL 1077 / CSA C22.2 No.235 (5 kA). It is halogen-free and silicon-free. RoHS and REACH declarations are standard with the SENTRON series; request them at quote time.

Where can I buy 5SY6340-6CC and what is the lead time?

Sourced and quoted to order against an RFQ through independent distribution. Availability and current pricing are confirmed at quote time — submit an RFQ for a firm commitment.

MPN
5SY6340-6CC