Carling C-Series CA3 50A 120/240V AC 3-Pole UL 489 Circuit Breaker
SKU CB-CA3-UL-120/240-50A
- Carling part number
- CA3-B0-24-650-321-CG
- Current
- 50A
- Poles
- 3
- Voltage
- 120/240V AC
- Protection class
- UL 489 listed and CSA certified circuit breaker
- Terminal
- 1/4-20 stud
- Color
- Black
- Series
- C-Series
Stocked items typically ship the next business day from our US warehouse. 30-day returns on unused stocked items. Exclusions apply. Return policy · Shipping policy
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About this product
50A 3-pole Carling C-Series CA3 120/240V AC UL 489 listed and CSA certified circuit breaker, MPN CA3-B0-24-650-321-CG.
Ordering-code details
- Application rating: 120/240V AC
- Actuator: One handle per pole; black handle with white legend
- Terminal: 1/4-20 stud
- Agency approval: UL 489 Listed and CSA Certified
Part-number breakdown
- Reference manual
- Carling C-Series datasheet, UL 489 Handle Ordering Scheme (p. 8)
- Complete manufacturer part number
- CA3-B0-24-650-321-CG
- 1. Series
- C — C-Series
- 2. Actuator
- A — Handle, one per pole
- 3. Poles
- 3 — 3 poles
- 4. Circuit
- B — Series trip (current)
- 5. Auxiliary/alarm switch
- 0 — Without auxiliary switch
- 6. Frequency and delay
- 24 — 50–60 Hz medium
- 7. Current rating code
- 650 — 50 A
- 8. Terminal
- 3 — 1/4-20 stud
- 9. Actuator color and legend
- 2 — Black actuator; white legend
- 10. Mounting
- 1 — 6-32 × 0.195 in threaded inserts; barriers on multipole units
- 11. Maximum application rating
- C — 120/240 V AC
- 12. Agency approval
- G — UL 489 Listed; CSA Certified
Product details
- Carling part number
- CA3-B0-24-650-321-CG
- Current
- 50A
- Poles
- 3
- Voltage
- 120/240V AC
- Protection class
- UL 489 listed and CSA certified circuit breaker
- Terminal
- 1/4-20 stud
- Color
- Black
- Series
- C-Series
- Amperage
- 50A
- Mounting
- Two 6-32 x 0.195-inch threaded inserts per pole; barriers
- Trip Free
- Yes - trips on overload with actuator held ON
- Actuator Type
- Handle, one per pole
- Terminal Type
- 1/4-20 Stud
- Agency Approval
- UL 489 listed and CSA certified circuit breaker
- Terminal Torque
- 30-35 in-lb (3.4-4.0 N-m)
- Trip Indication
- Positive OFF-position indication on electrical trip
- Dielectric Strength
- 1,960 V, 50/60 Hz, 1 minute between electrically isolated terminals
- Mechanical Endurance
- 10,000 ON-OFF operations at 6 per minute with rated current and voltage
- Insulation Resistance
- Minimum 100 megohms at 500 VDC
- Operating Temperature
- -40 C to +85 C
- Mounting Hardware Torque
- 7-9 in-lb (0.8-1.0 N-m)
Shipping & returns
- Stocked items typically ship the next business day from our US warehouse.
- 30-day returns on unused stocked items. Exclusions apply. See policy
- Custom and quoted items are non-returnable once production begins.
Warranty
Backed by the original manufacturer’s warranty plus our workmanship guarantee on assembled harnesses. Contact us with your invoice and we’ll coordinate any covered repair or replacement.
Read the full warranty termsTechnical support
Need help choosing the right part?
Our marine electrical team can review your setup and recommend compatible products. Send a photo, a sketch, or your circuit list and we'll come back with a parts list that fits the boat.
Certifications & training
- ABYC-aware build practices
- OEM-grade marine wire & terminals
Additional capabilities are based on hands-on experience building marine wiring systems rather than third-party certification.
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Why buy from Common Ground Marine
- 20+ years building marine wiring harnesses, panels, and shore-power systems.
- Engineers — not a phone tree — review every custom build before parts are cut.
- OEM-grade components: tinned copper, sealed connectors, marine-rated jackets.