Three-Phase CSP Low voltage Oil-Immersed Circuit Breaker---Reliable protection and smart control for modern distribution systems.
Three-phase CSP low-voltage oil-immersed circuit breaker is an integrated self-protected breaker that uses oil as both insulation and cooling medium. It provides over-current, short-circuit, and surge protection, making it ideal for distribution transformers and low-voltage power systems that require reliable circuit protection.
| Parameter | Description |
| Capacity | 5-300KVA |
| Rated Current | 42 -433 Amps |
| Poles | 3 Poles |
| Operation Mode | Automatic / Manual / Motorized |
| Installation Type | Pole-mounted/pedestal-mounted or pad-mounted |
| Insulation Medium | Mineral oil / Eco insulating oil |
| Standards | ANSI / IEEE/ IEC / PLN |
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420 ThaiStyle 3F Circuit Breaker [57.4mm]- Model: 3P420T120
- Rated Current: 420A
- For Transformer: 300KVA/300KVA
- Rated Voltage: 400V/420KVA
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313 Thai Style 3F Circuit Breaker [57.4mm]- Model: 3P313T110
- Rated Current: 313A
- For Transformer: 200KVA/225KVA
- Rated Voltage: 400V/420KVA
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210 ThaiStyle 3F Circuit Breaker [57.4mm]- Model: 3P210T110
- Rated Current: 210A
- For Transformer: 150KVA/150KVA
- Rated Voltage: 400V/420KVA
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157 ThaiStyle 3F Circuit Breaker [57.4mm]- Model: 3P157T110
- Rated Current: 157A
- For Transformer: 100KVA/112.5KVA
- Rated Voltage: 400V/420KVA
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105 ThaiStyle 3F Circuit Breaker [57.4mm]- Model: 3P105T110
- Rated Current: 105A
- For Transformer: 75KVA/75KVA
- Rated Voltage: 400V/420V
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63 ThaiStyle 3F Circuit Breaker [57.4mm]- Model: 3P63T110
- Rated Current: 63A
- For Transformer: 45KVA/50KVA
- Rated Voltage: 400V/420V
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Main Features and Advantages
- Oil-immersed design with excellent insulation and heat dissipation
- Long mechanical lifespan and strong breaking capacity
- Automatic tripping and re-closing functions
- Long maintenance intervals minimize downtime
- Can be paired with low-voltage surge arrester & high-voltage fuse link for full protection
Typical Applications
Ketrans Three phase oil-immersed self-protected breaker used as distribution transformer protection switch. Widely used in distribution systems, industrial power equipment, compact substations, rural grids, and public utility power networks — particularly in applications requiring reliable low-voltage line protection
Tips for Installation & Maintenance
Ensure the CSP three-phase transformer circuit breaker is installed horizontally with securely fastened terminals. Check oil level and quality regularly, and perform maintenance or oil replacement every 3–5 years. Avoid prolonged operation in extreme temperatures or heavily contaminated environments.
Regional and Industry SEO Extension
Our Three-phase CSP oil-immersed circuit breakers are very popular in Southeast Asia, Latin America, the United States and Canada. Certified to IEC ,ANSI and IEEE standards,Obtained patent certificate and successful testing report from third-party independent laboratory，the products can be customized to meet local grid requirements.
