Siemens
Siemens 5SX21-C5 5A Miniature Circuit Breaker
Siemens 5SX21-C5 5A Miniature Circuit Breaker
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12-Mo Warranty
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12-month warranty
All units tested
Same-day dispatch
Order by 2pm CST
Worldwide delivery
US, EU, Asia, Middle East
Veteran-owned
CAGE: 9NK75
5A rating
Single pole
C-curve tripping
DIN rail mounting
Thermal-magnetic protection
6kA interrupting capacity
Product description
The Siemens 5SX21-C5 is a single-pole miniature circuit breaker with a 5 Amp rating and a C-curve tripping characteristic, providing reliable overcurrent and short-circuit protection.
This breaker is commonly employed in residential and commercial electrical installations for circuits like lighting, fans, and control systems where a C-curve is beneficial for handling expected inrush currents.
Source your Siemens 5SX21-C5 from Stanlo Automation, a veteran-owned business committed to providing quality surplus electrical components with excellent service and fast shipping.
Technical specifications
| Amperage | 5A |
| Poles | 1 |
| Voltage | 230/400V AC |
| Tripping Characteristic | C |
| Interrupting Rating | 6kA |
Common applications
Lighting circuits
Control circuits
Fan circuits
Small appliances
Residential distribution panels
Compatible systems
Standard 35mm DIN rail systems.
Also known as
Siemens 5SX21 C5, Siemens 5A C-Curve Breaker
Replaces / compatible with
The 5SX21-C5 is a direct replacement for other Siemens 5SX21 series breakers with identical ratings. It can also be used as a substitute for comparable 5A, C-curve, single-pole breakers from other manufacturers.
Technical note
Expert tip
Verify that the 5A rating is sufficient for the continuous load plus any anticipated inrush.What happens next?
1
Email confirmation
Immediate receipt acknowledgment sent to you
2
Account manager assigned
Confirms your part's spec and condition
3
Your quote delivered
Tailored to your specific requirements
Frequently asked questions
What is the difference between a C-curve and a B-curve breaker like the Siemens 5SX21-C5?
A C-curve breaker, like the 5SX21-C5, trips between 5-10 times its rated current, making it suitable for circuits with moderate inrush, such as lighting or small motors. A B-curve breaker trips between 3-5 times its rated current and is typically used for purely resistive loads or very small inductive loads.