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CSP Self-Protected Transformers Series Single Phase Transformers
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CSP Completely Self-Protected Transformers — Single Phase
CSP (Completely Self-Protected) single-phase pole-mounted transformers integrate primary overcurrent protection, a lightning arrester, and a secondary circuit breaker inside the tank, eliminating the need for external cutouts. Built to ANSI/IEEE C57.12.20 construction, rated 10–100 kVA for 12–34.5 kV distribution with 120/240V secondary, widely used in North American and Latin American networks.
Key Features
- Integrated primary fuse, lightning arrester and secondary breaker
- No external cutout or arrester required
- ANSI/IEEE C57.12.20 self-protected construction
- 10–100 kVA, 12–34.5 kV primary, 120/240V secondary
- Overload and short-circuit protection built into the tank
- Simplified pole-top installation and reduced field wiring
Applications
- North American and Latin American distribution
- Single-phase overhead networks
- Residential and farm distribution
- Remote sites with simplified protection
Selection Guide
Protection
Confirm integrated fuse/arrester/breaker ratings match the network fault levels.
Voltage
Match 12–34.5 kV primary and 120/240V secondary to the system.
Capacity
Size 10–100 kVA from the connected single-phase load.
- Frequently Asked Questions
What is a CSP transformer?
CSP (Completely Self-Protected) transformers integrate the primary overcurrent protection, lightning arrester and secondary circuit breaker inside the unit, so no separate cutout, fuse or arrester is needed at the pole.
What standard defines CSP construction?
ANSI/IEEE C57.12.20 covers overhead-type distribution transformers including self-protected (CSP) designs.
What are the benefits?
Simpler pole-top installation, fewer external components to maintain, and built-in protection against overload, short circuit and lightning surges.
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Complete equipment — no winding copper linkage
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