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Siemens 5SJ6540-7 — 1-Pole MCB (DIN Rail)

Siemens SENTRON 5SJ6540-7 MCB, 1P+N, 40 A, C-Curve, 6 kA

MPN5SJ6540-7

Siemens SENTRON 5SJ6 series, miniature circuit breaker 5SJ6540-7, 1P+N, 40 A, C characteristic, 6 kA breaking capacity, 240 V AC, 70 mm depth.

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

Specifications

5SJ6540-7 — Identification
ParameterValue
Product designationMiniature circuit breakers
Brand nameSENTRON
Number of poles2
5SJ6540-7 — Electrical & Protection
ParameterValue
Tripping characteristic classC
Rated value (EN 60898)6 kA
Overvoltage category3
5SJ6540-7 — Mounting & Connection
ParameterValue
Mounting positionany
Installation depth70 mm
Torque, min.-40 °C
Torque, max.75 °C
SealableYes
5SJ6540-7 — Environmental
ParameterValue
IP protection classIP20, with connected conductors
Halogen-freeYes
Silicone-freeYes

Product details

The Siemens SENTRON 5SJ6540-7 is a 1P+N miniature circuit breaker rated 40 A with a C tripping characteristic, breaking 6 kA at 240 V AC per EN 60898 and also 6 kA per IEC 60947-2. The 1P+N pole configuration switches the line conductor and provides a switched neutral; the neutral pole is not overcurrent-protected, so this breaker is intended for single-phase circuits where the neutral is switched but not monitored for overload.

DIN-rail fit and panel integration

The sealable feature allows the toggle to be locked in the OFF position for lockout/tagout, which is useful during panel maintenance.

The insulation voltage is rated 440 V AC, and the overvoltage category is 3, so it is suitable for fixed-installation distribution boards downstream of the service entrance. Vibration resistance per IEC 60068-2-6 is 50 m/s² at 25 to 150 Hz and 60 m/s² at 10 to 150 Hz, which covers most industrial panel vibration profiles including those near compressors or conveyors.

Frequently asked questions

Where can I buy the 5SJ6540-7?

The 5SJ6540-7 is sourced and quoted to order against an RFQ through independent distribution. Availability and current pricing are confirmed at quote time.

What is the difference between the 5SJ6540-7 and the 5SL4120-7CC?

The 5SJ6540-7 is a 1P+N, 40 A, C-curve breaker with 6 kA breaking capacity. The 5SL4120-7CC is a 1P, 20 A, C-curve breaker with a higher 10 kA breaking capacity per EN 60898. The 5SL4120-7CC also has a narrower 1-module width (18 mm) versus the 2-module width of the 5SJ6540-7. They are not drop-in replacements — the pole count, current rating, and physical width differ.

What is the temperature range for the 5SJ6540-7?

The 5SJ6540-7 has an operating temperature range of -40 °C to 75 °C, which covers most indoor and outdoor enclosure environments.

What compliance documentation is available for the 5SJ6540-7?

The 5SJ6540-7 is designed to EN 60898 and IEC 60947-2, and carries an IP20 protection class. The device is halogen-free and silicon-free. Specific RoHS and REACH declarations are available from the manufacturer's documentation portal.

MPN
5SJ6540-7