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Siemens 5SL3340-6 — 3-Pole MCB (DIN Rail)

Siemens 5SL3340-6 SENTRON MCB, 3P B 40A 4.5kA

MPN5SL3340-6

Siemens SENTRON 5SL3340-6, miniature circuit breaker, 3-pole, B characteristic, 40 A rated current, 4.5 kA breaking capacity, 400 V AC.

Siemens 5SL3340-6 datasheet (PDF)
Sourced new & surplus through independent channelsAuthenticity-screened · ESD-safe packingListing updated Aug 2026

Specifications

5SL3340-6 — Identification
ParameterValue
Brand nameSENTRON
Number of poles3
Pole configuration3P
Suitability for operationResidential buildings/infrastructure
5SL3340-6 — Protection
ParameterValue
Tripping characteristic (curve)B
Breaking capacity per EN 608984.5 kA
Breaking capacity per IEC 60947-24.5 kA
Overvoltage categoryIII
IP protection classIP20, with connected conductors
Energy limitation class3
Pollution degree2
5SL3340-6 — Electrical
ParameterValue
Rated current (AC)40 A
Rated voltage (AC, multi-phase)440 V
5SL3340-6 — 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
SealableYes
5SL3340-6 — Environmental
ParameterValue
Halogen-freeYes
Silicone-freeYes

Product details

The Siemens 5SL3340-6 is a SENTRON miniature circuit breaker, 3-pole, B-curve, rated 40 A at 30 °C with a 4.5 kA breaking capacity per EN 60898 and IEC 60947-2. It's designed for 400 V AC three-phase circuits, with a maximum of 440 V AC in multi-phase operation. Rated 38.07 A at 40 °C and 34.97 A at 55 °C, so if your panel runs hot, you lose about 12% capacity at the upper end of the ambient range.

Panel Fit & Installation

Mounts on DIN rail in any position — 3 modular width units (54 mm wide), 76 mm deep, 90 mm tall, with an installation depth of 70 mm. IP20 with conductors connected, so it's for enclosed panels, not washdown areas. Touch protection is built in. Sealable, halogen-free, silicon-free — that's another SKU I don't need to worry about for sensitive environments like clean rooms or food processing lines. No neutral conductor switching on this 3-pole unit.

Frequently asked questions

What is the breaking capacity of the 5SL3340-6?

The 5SL3340-6 has a 4.5 kA breaking capacity per both EN 60898 and IEC 60947-2. That means it can safely interrupt fault currents up to 4.5 kA at 400 V AC without welding contacts or cascading failure upstream.

What does the B-curve characteristic mean for this breaker?

The B-curve trips at 3 to 5 times rated current (120 to 200 A for this 40 A unit). It's intended for resistive and light inductive loads like lighting circuits, socket outlets, and control transformers where inrush is low — not for motor starting or heavy transformer loads that would need a C or D curve.

Will the 5SL3340-6 drop into a panel specified for 5SL4120-7CC?

Not without verifying the circuit requirements. The 5SL3340-6 is a 3-pole B-curve 40 A unit; the 5SL4120-7CC is a different variant. Check the pole count, curve, and current rating of your existing specification before substituting.

What compliance documentation is available for the 5SL3340-6?

The 5SL3340-6 carries IEC 60947-2 and EN 60898 ratings, overvoltage category III, pollution degree 2, and is halogen-free and silicon-free. Standard SENTRON compliance documentation (CE, declaration of conformity) is available through the manufacturer's channels.

Where can I buy the 5SL3340-6?

The 5SL3340-6 is 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 price and lead time.

MPN
5SL3340-6