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Siemens 5SY4120-7KK11 — 1-Pole MCB (DIN Rail)

Siemens 5SY4120-7KK11 SENTRON MCB, 1P C-Curve, 10kA IEC 6089

MPN5SY4120-7KK11

Siemens SENTRON 5SY4120-7KK11, 1-pole miniature circuit breaker, C-curve, 10 kA per EN 60898-1, 20 kA per IEC 60947-2, 18 mm wide, DIN rail mount.

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

Specifications

5SY4120-7KK11 — Identification
ParameterValue
Product designationMiniature circuit breaker
Brand nameSENTRON
Number of poles1
Pole design1P
Application suitabilityMechanical engineering / industry
5SY4120-7KK11 — Electrical & Protection
ParameterValue
Tripping characteristic classC
Energy limitation class3
Overvoltage categoryIII
5SY4120-7KK11 — 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
5SY4120-7KK11 — Environmental
ParameterValue
IP protection classIP20, with connected conductors
Pollution degree3
Halogen-freeYes
Silicone-freeYes

Product details

The Siemens 5SY4120-7KK11 is a 1-pole SENTRON miniature circuit breaker with a C-curve trip characteristic, rated 10 kA breaking capacity according to DIN EN 60898-1 and 20 kA according to IEC 60947-2.

Railway-rated build, panel-ready footprint

The 18 mm width (1 modular unit) clips onto any DIN rail — quick-assembly fastening, mountable in any position. Depth is 76 mm with 70 mm installation depth required behind the panel.

Breaking capacity — what the two ratings mean

The 10 kA rating under EN 60898-1 covers the standard household/commercial fault-current test. The 20 kA rating under IEC 60947-2 is the industrial-grade figure — it guarantees the breaker clears a 20 kA prospective fault at 400 VAC without welding or rupturing. For DC circuits it's rated 15 kA at up to 72 V.

Frequently asked questions

Where can I buy 5SY4120-7KK11 and how do I get a price?

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.

Will 5SY4120-7KK11 drop into a panel specified around 5SY4140-7 without rewiring?

Both are 1-pole SENTRON MCBs in the same 18 mm DIN-rail footprint, so the mechanical swap is straightforward. The key difference is the current rating — verify the branch circuit's load before substituting. The 5SY4120-7KK11 is a 20 A C-curve; the 5SY4140-7 would be a different rating.

What compliance documentation does this brand provide for 5SY4120-7KK11?

The MCB is certified to DIN EN 60898-1 and IEC 60947-2. It is halogen-free and silicon-free. Standard Siemens SENTRON documentation includes CE declaration, RoHS/REACH compliance statements, and the product-specific datasheet.

MPN
5SY4120-7KK11