Siemens
Siemens 5SX21-C20 20A Miniature Circuit Breaker
Siemens 5SX21-C20 20A Miniature Circuit Breaker
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12-Mo Warranty
Same-Day Dispatch
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🎖 Veteran-Owned
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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
20A rating
Single pole
C-curve tripping
High inrush current capability
DIN rail mounting
Thermal-magnetic protection
Product description
The Siemens 5SX21-C20 is a single-pole miniature circuit breaker rated for 20 Amps and featuring a C-curve tripping characteristic. This breaker is engineered for robust protection against overloads and short circuits in demanding environments.
With its 20A capacity and C-curve, this breaker is well-suited for industrial machinery, control panels, and power distribution where higher inrush currents are expected. It provides reliable safety and operational continuity.
Stanlo Automation, your veteran-owned source for industrial automation parts, offers the Siemens 5SX21-C20 with quick shipping and dedicated support.
Technical specifications
| Amperage | 20A |
| Poles | 1 |
| Voltage | 230/400V AC |
| Tripping Characteristic | C |
| Interrupting Rating | 6kA |
Common applications
Industrial control panels
Machine tool circuits
Motor branch circuits
Power distribution
Commercial applications
Compatible systems
Standard 35mm DIN rail systems.
Also known as
Siemens 5SX21 C20, Siemens 20A C-Curve Breaker
Replaces / compatible with
The 5SX21-C20 is a direct replacement for other Siemens 5SX21 series breakers with identical ratings. It serves as a reliable substitute for comparable 20A, C-curve, single-pole breakers from various manufacturers.
Technical note
Expert tip
For motor applications, ensure the breaker's rating is coordinated with the motor's full load current and starting characteristics.What happens next?
1
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2
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Confirms your part's spec and condition
3
Your quote delivered
Tailored to your specific requirements
Frequently asked questions
Can the Siemens 5SX21-C20 be used for motor protection?
Yes, the Siemens 5SX21-C20 with its C-curve characteristic is suitable for protecting smaller motors or circuits with higher starting currents. The C-curve provides a delay for inrush current, preventing nuisance tripping.