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Siemens 5SY5120-7KK11 — 1-Pole MCB (DIN Rail)

Siemens 5SY5120-7KK11 SENTRON MCB, 1P C20, 10kA, 18mm

MPN5SY5120-7KK11

Siemens SENTRON 5SY5120-7KK11, 1-pole miniature circuit breaker, C-curve 20 A, 10 kA breaking capacity per EN 60898, 15 kA per IEC 60947-2, 18 mm width, halogen-free, silicon-free, railway design.

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

Specifications

5SY5120-7KK11 — Identification
ParameterValue
Product designationMiniature circuit breaker
Brand nameSENTRON
Number of poles1
Pole design1P
Application suitabilityuniversal current
5SY5120-7KK11 — Electrical & Protection
ParameterValue
Tripping characteristic classC
Energy limitation class3
Overvoltage categoryIII
5SY5120-7KK11 — Mounting & Connection
ParameterValue
Mounting positionany
Fastening methodQuick assembly system
Combined terminal, topYes
Combined terminal, bottomYes
Width18 mm
Height90 mm
Depth76 mm
Installation depth70 mm
Modular width units1
Torque, min.-40 °C
Torque, max.75 °C
SealableYes
5SY5120-7KK11 — Environmental
ParameterValue
IP protection classIP20, with connected conductors
Pollution degree3
Halogen-freeYes
Silicone-freeYes

Product details

SENTRON 5SY5120-7KK11 — 1-pole C20 MCB for universal-current circuits

Rated for universal-current operation (AC/DC), the C-curve characteristic handles moderate inrush loads — typical for motor starters, contactor coils, and small transformers — without nuisance tripping. The 1-pole design occupies a single 18 mm modular width on DIN rail.

At 400 V AC the MCB is rated for 10 kA per EN 60898; at DC it delivers 10 kA per EN 60898-2 and 15 kA per IEC 60947-2 up to 250 V DC. The higher IEC 60947-2 figure gives the panel designer additional fault-current headroom when coordinating with downstream loads in industrial installations. Energy limitation class 3 means this breaker limits let-through energy during a short-circuit, aiding selective coordination with upstream devices.

Panel integration — 18 mm width, any position, sealable

At 18 mm wide (1 modular unit), it fits standard distribution boards. Mounting position is unrestricted. The breaker is sealable, allowing lockout/tagout in safety circuits.

Frequently asked questions

Where can I buy the 5SY5120-7KK11?

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

What is the closest functional second-source to the 5SY5120-7KK11?

The 5SY4140-7 series shares the same SENTRON platform and C-curve characteristics, but verify the specific current rating and breaking capacity for your application. The 5SY5120-7KK11 is a 1-pole 20 A unit; the 5SY4140-7 variants cover different ampacities.

Will the 5SY5120-7KK11 drop into a panel specified around the 5SY4140-7?

Yes — both are 1-pole SENTRON MCBs on the same 18 mm footprint with identical DIN-rail mounting. No rewiring of the busbar or terminal layout is needed for the swap.

What compliance documentation does Siemens provide for the 5SY5120-7KK11?

As a current SENTRON product, it carries CE marking per the Low Voltage Directive. The halogen-free and silicon-free construction supports RoHS and REACH compliance. Railway application design implies EN 50155 / EN 61373 qualification, though the specific certification scope should be confirmed from the manufacturer's declaration.

MPN
5SY5120-7KK11