Siemens 5SX21-C20 Circuit Breaker

Siemens 5SX21-C20 Circuit Breaker

$75.00

The Siemens 5SX21-C20 is a single-pole miniature circuit breaker from the 5SX2 series, rated at 20A with C-curve tripping for branch circuit protection. It operates at up to 277V AC and 55V DC per pole, serving both AC and DC branch circuit installations.

3 in stock

SKU: 5SX21-C20 Category: Brand:

Description

  • C-Curve Tripping: Suits circuits with moderate inrush loads.
  • Dual AC/DC Rating: Operates at 277V AC and 55V DC.
  • DIN Rail Mounting: Installs directly in standard panel enclosures.
  • Dual Standard Listing: Meets both IEC and UL 1077 requirements.
  • Single-Pole Configuration: Protects individual branch circuits at 20A.

Documentation

Technical Specifications

Manufacturer Siemens
Part Number 5SX21-C20
Alternative Part Number 5SX2120-7
Type Circuit Breaker
Series 5SX2
Configuration Single Pole, C-Curve
Current Rating 20A
UL/IEC Rating 277V AC / 55V DC per pole
Mounting Type DIN Rail
Standard IEC / UL 1077

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Description

The Siemens 5SX21-C20 is a single-pole miniature circuit breaker from the 5SX2 series, rated per IEC and UL 1077 standards for overcurrent and short-circuit protection. It uses a C-curve tripping characteristic suited to circuits with moderate inrush currents and operates at up to 277V AC or 55V DC per pole.

It is also cataloged under part number 5SX2120-7, which aids cross-referencing during procurement and replacement sourcing. The breaker mounts on standard DIN rail in a single-pole footprint and is rated per both IEC and UL 1077 standards, confirming its suitability for international and North American panel installations.

Frequently Asked Questions

What is the maximum AC voltage rating for the 5SX21-C20?

The single-pole breaker is rated at a maximum of 277V AC per UL 1077 standards.

Can the 5SX21-C20 be used on DC circuits?

Yes. It is rated for 55V DC per pole under IEC maximum DC ratings.

What is the alternative catalog number for the 5SX21-C20?

The breaker is also listed as 5SX2120-7, which is the Siemens catalog designation for the same product.

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