Home › Manufacturers › Siemens › 5SX21-C4

Siemens

Siemens 5SX21-C4 Miniature Circuit Breaker — C Curve, 4A

Siemens 5SX21-C4 1-Pole Miniature Circuit Breaker

● In Stock 12-Mo Warranty Same-Day Dispatch Ships Worldwide 🎖 Veteran-Owned

In Stock — Ready to Ship

ManufacturerSiemens

Part number5SX21-C4

Poles 1

Rated Current 4A

Tripping Characteristic C

Voltage Rating 230/400V AC

Get a price for 5SX21-C4

Response within 1 business hour

🛡

12-month warranty

All units tested

⚡

Same-day dispatch

Order by 2pm CST

🌐

Worldwide delivery

US, EU, Asia, Middle East

🎖

Veteran-owned

CAGE: 9NK75

1-pole protection Type C tripping curve 6kA breaking capacity DIN rail mountable Overcurrent and short-circuit protection

Product description

The Siemens 5SX21-C4 is a single-pole miniature circuit breaker (MCB) from the 5SX2 series. It is designed for overcurrent protection in electrical installations, featuring a Type C tripping characteristic which provides protection against short-circuit currents with a higher magnetic trip point, suitable for circuits with moderate inrush currents.

This MCB is widely used in residential, commercial, and industrial applications for protecting circuits in lighting, sockets, and some types of equipment. Its compact design and reliable performance make it a staple in distribution boards and control panels.

Stanlo Automation, a veteran-owned surplus parts distributor, offers the Siemens 5SX21-C4. Secure your essential components from a trusted source for industrial automation needs.

Technical specifications

Poles	1
Rated Current	4A
Tripping Characteristic	C
Voltage Rating	230/400V AC
Breaking Capacity	6kA

Common applications

Residential wiring

Commercial buildings

Industrial control panels

Lighting circuits

Socket outlet protection

Compatible systems

Standard DIN rail mounting systems

Also known as

Siemens 5SX21-C4 5SX21C4 Siemens MCB

Replaces / compatible with

Replaces older or obsolete single-pole miniature circuit breakers with similar specifications.

Technical note

Expert tip

The 5SX21-C4 is designed for thermal and electromagnetic tripping, providing protection against overloads and short circuits respectively.

What happens next?

Email confirmation

Immediate receipt acknowledgment sent to you

Account manager assigned

Confirms your part's spec and condition

Your quote delivered

Tailored to your specific requirements

Frequently asked questions

What is the tripping characteristic of the Siemens 5SX21-C4?

The Siemens 5SX21-C4 features a Type C tripping characteristic. This means it is designed to trip between 5 to 10 times the rated current, making it suitable for circuits with moderate inductive loads or inrush currents, such as fluorescent lighting or small motors.