30 Amp Breaker

FAQ for 30A Circuit Breakers

Q1: What is a 30A circuit breaker?

A: A 30A circuit breaker is a protective device for AC 50/60Hz, 230V/400V circuits, designed to prevent overloads (sustained overcurrents) and short circuits (sudden power surges). It also isolates circuits for safety, making it ideal for infrequent line switching in homes, commercial spaces, and light industrial applications.

Q2: 30a circuit breaker price

A: The price of a 30A circuit breaker varies based on brand, tripping type (B/C/D), and additional features (e.g., surge protection). For accurate pricing, contact authorized distributors or check local electrical supply stores.

Q3: what is the frame size of a 30a circuit breaker

A: The 30A circuit breaker is designed to mount on a standard 35mm DIN rail (EN 60715), ensuring compatibility with most electrical panels. Exact physical dimensions may vary slightly by manufacturer but follow industry-standard space-saving designs.

Q4: how to test a 30a circuit breaker

A: To test, temporarily apply a load exceeding 30A (e.g., 35-40A for a C-type breaker) – it should trip within seconds. For safety, use a multimeter to check continuity when the circuit is off, or consult a licensed electrician for professional testing.

Q5: how to install 30a circuit breaker

A: Install on a 35mm DIN rail (EN 60715) using a fast-clip mechanism. Connect wires to top or bottom terminals with a Phillips or flat-blade screwdriver, tightening to 2N·m for secure connections. Always disconnect power before installation.

Q6: What can I run off of a 30 amp breaker?

A: A 30A breaker supports devices up to ~6,900W (230V×30A). Common applications include electric water heaters, large air conditioners, welding machines, or combinations of kitchen appliances (e.g., ovens, microwaves).

Q7: Can you run 50 amps on a 30 amp breaker?

A: No. A 30A breaker trips at 3-20× rated current (depending on B/C/D type) to prevent damage. Exceeding 30A (e.g., 50A) will cause immediate tripping to avoid overheating or fire.

Q8: What are the B/C/D tripping types in a 30A circuit breaker?

A:

• B-type: For resistive loads (e.g., heaters) – trips at 3-5×30A (90-150A).
• C-type: For mixed loads (e.g., motors) – trips at 5-10×30A (150-300A).
• D-type: For high-inrush loads (e.g., transformers) – trips at 10-20×30A (300-600A).

Q9: What’s the lifespan of a 30A circuit breaker?

A: Most 30A breakers have an electrical life of 10,000 load-breaking cycles and a mechanical life of 20,000 no-load operations, ensuring long-term reliability.

Q10: What’s the max wire size for a 30A breaker?

A: Supports cables or bus bars up to 25mm², compatible with standard household and commercial wiring.