Skip to main content
Siemens 5SY4120-6 — 1-Pole MCB (DIN Rail)

Siemens 5SY4120-6 SENTRON MCB, 1P B-Curve, 10kA/20kA

MPN5SY4120-6
Active

Siemens SENTRON 5SY4120-6, 1-pole B-curve miniature circuit breaker, 10 kA (EN 60898-1) / 20 kA (IEC 60947-2), 400 VAC, 18 mm wide, IP20.

$71.15Ref. price · indicative, final on quote
Sourced new & surplus through independent channelsAuthenticity-screened · ESD-safe packingListing updated Aug 2026

Specifications

5SY4120-6 — Identification
ParameterValue
Product designationMiniature circuit breaker
Brand nameSENTRON
Number of poles1
Pole design1P
Application suitabilityMechanical engineering / industry
5SY4120-6 — Electrical & Protection
ParameterValue
Tripping characteristic classB
Energy limitation class3
Overvoltage categoryIII
5SY4120-6 — 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
5SY4120-6 — Environmental
ParameterValue
IP protection classIP20, with connected conductors
Pollution degree3
Halogen-freeYes
Silicone-freeYes

Product details

Rated breaking capacity is 10 kA per IEC/EN 60898-1 and 20 kA per IEC 60947-2, with a further 15 kA at DC (60 V per pole) per IEC 60947-2. That dual rating means it meets the higher fault-current demands of industrial panel coordination (60947-2) while also qualifying for residential and commercial final circuits under 60898-1. Depth is 76 mm (70 mm installation depth), so it sits flush with standard distribution board covers. The IP20 rating applies with conductors connected — expected for a panel-mount device.

Certifications and compliance

Certified to IEC/EN 60898-1 and IEC/EN 60947-2, with additional UL 1077 and CSA C22.2 No. 235 recognition (5 kA at AC). The housing is sealable — a feature for panel builders who need to lock out adjustment after commissioning.

Environmental range

Operates from -40 °C to 75 °C ambient, with humidity derating: 95% RH up to 55 °C, 55% RH to 70 °C, and 35% RH to 75 °C. That -40 °C floor is relevant for unheated enclosures in cold climates or refrigerated areas.

Frequently asked questions

What is the breaking capacity of 5SY4120-6?

Rated 10 kA per IEC/EN 60898-1 and 20 kA per IEC 60947-2 at 400 VAC. At DC (60 V per pole) it is rated 15 kA per IEC 60947-2. For UL 1077 applications it carries a 5 kA rating.

What certifications does the 5SY4120-6 carry?

Certified to IEC/EN 60898-1 and IEC/EN 60947-2, with UL 1077 and CSA C22.2 No. 235 recognition. The housing is halogen-free and silicon-free.

What is the physical size of 5SY4120-6?

Width 18 mm (1 modular unit), depth 76 mm (70 mm installation depth), height 90 mm. It mounts on DIN rail in any position.

Where can I buy 5SY4120-6 and get current pricing?

This part is sourced and quoted to order against an RFQ through independent distribution. Availability and current pricing are confirmed at quote time — submit a request for a firm quotation.

MPN
5SY4120-6