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Siemens 5SJ4220-7HG42 SENTRON Circuit Breaker | 20A 2-Pole 480Y/277V

Siemens 5SJ4220-7HG42 2-Pole Miniature Circuit Breaker

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ManufacturerSiemens

Part number5SJ4220-7HG42

Poles 2

Current Rating 20A

Voltage Rating 480Y/277V AC

Interrupting Capacity 10kA

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2-pole design 20A current rating 10kA interrupting capacity C-curve tripping 480Y/277V rating UL 489 listed

Product description

The Siemens 5SJ4220-7HG42 is a 2-pole miniature circuit breaker from the SENTRON series, designed for reliable protection in high-voltage applications. It is rated for 480Y/277V AC and has a 20A current rating, with a 10kA interrupting capacity. This breaker utilizes a thermal magnetic tripping mechanism and is compliant with UL 489 standards, ensuring robust protection against overloads and short circuits.

This circuit breaker is engineered for demanding industrial and commercial environments, providing essential protection for electrical systems. Its compact design and DIN rail mounting allow for straightforward integration into control panels and electrical distribution systems.

Stanlo Automation, a veteran-owned surplus parts distributor, offers the Siemens 5SJ4220-7HG42. We provide dependable access to quality surplus industrial automation components, ensuring you can source essential parts for your maintenance and operational needs.

Technical specifications

Poles	2
Current Rating	20A
Voltage Rating	480Y/277V AC
Interrupting Capacity	10kA
Tripping Curve	C
Mounting	DIN Rail
Standards	UL 489

Common applications

Industrial control panels

Electrical distribution systems

Branch circuit protection

High voltage applications

Control systems

Compatible systems

Designed for easy installation on standard 35mm DIN rails in various industrial and commercial electrical enclosures.

Also known as

Siemens SENTRON 5SJ4220-7HG42 5SJ42207HG42 Siemens 20A 480V circuit breaker

Replaces / compatible with

This circuit breaker is suitable for replacing older Siemens models with similar voltage, current, and interrupting capacity ratings within the 5SJ4 series.

Technical note

Expert tip

The thermal magnetic trip unit offers reliable protection against overloads and short-circuits, with the C-curve suitable for general-purpose applications.

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Frequently asked questions

What makes the Siemens 5SJ4220-7HG42 suitable for 480Y/277V systems?

The Siemens 5SJ4220-7HG42 is rated for 480Y/277V AC and meets UL 489 standards, making it compliant for use in branch circuits within electrical systems operating at these voltages.