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Siemens 5SY4220-8 Miniature Circuit Breaker — 2-Pole, Type D, 20A

Siemens 5SY4220-8 2-pole miniature circuit breaker.

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ManufacturerSiemens

Part number5SY4220-8

Rated Voltage 400V AC

Breaking Capacity 10kA

Poles 2

Tripping Characteristic Type D

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2-pole protection Type D tripping curve for high inrush 10kA breaking capacity 400V AC operational voltage 70mm compact design Suitable for motors

Product description

The Siemens 5SY4220-8 is a 2-pole miniature circuit breaker equipped with a Type D tripping characteristic, designed for high inrush current applications. It offers protection at 400V AC with a robust 10kA breaking capacity. This breaker is rated for 20A and features a 70mm depth for standard installation.

This circuit breaker is particularly well-suited for circuits supplying equipment with very high, short-duration inrush currents, such as large motors, welding equipment, or high-power supplies. It ensures reliable circuit protection in demanding industrial environments.

Source your Siemens 5SY4220-8 from Stanlo Automation, your reliable veteran-owned distributor of surplus industrial automation parts. We specialize in providing hard-to-find components to keep your critical systems operational and minimize downtime.

Technical specifications

Rated Voltage	400V AC
Breaking Capacity	10kA
Poles	2
Tripping Characteristic	Type D
Rated Current	20A
Depth	70mm
Series	5SY4

Common applications

Motor starting circuits

Heavy machinery

Industrial equipment

High inrush loads

Power supplies

Manufacturing automation

Compatible systems

Standard DIN rail mounting Siemens industrial automation solutions

Also known as

Siemens 5SY4220-8 MCB Siemens 20A Type D breaker 5SY4 Type D 20A

Replaces / compatible with

The Siemens 5SY4220-8 is interchangeable with other Siemens 5SY4 series miniature circuit breakers having the same part number and specifications. It adheres to standard DIN rail mounting practices.

Technical note

Expert tip

Type D breakers are essential for preventing nuisance tripping on startup for loads with significant inductive components.

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Frequently asked questions

When should I use a Siemens 5SY4220-8 circuit breaker with a Type D tripping curve?

A Type D tripping curve, like that on the Siemens 5SY4220-8, is recommended for circuits that feed equipment with very high, short-duration inrush currents. This includes devices like large motors, transformers, and X-ray equipment, where the initial startup current can be 10 to 20 times the rated current.