S&C Electric 578125R4 - SM-4 Fuse Refill 115kV (Very Slow Blow)

S&C Electric 578125R4 is a high-voltage fuse refill designed for circuit protection in electrical distribution systems. Rated for 115kV applications, this very slow-acting fuse provides reliable overcurrent protection with precise interruption characteristics. The SM-4 family fuse features durable construction with a standardized 578-type refill configuration, weighing 1 lb for easy handling during maintenance. It meets industry standards for high-voltage protection devices and is commonly used in utility substations, industrial power distribution, and transmission line protection systems.

Key Features & Specifications

• Type: SM-4 family, 578-type fuse refill, very slow blow characteristic
• Voltage Rating: 115,000V AC
• Current Rating: Not specified (configuration-dependent)
• Dimensions: Standard SM-4 form factor
• Standards: Industrial high-voltage fuse requirements
• Applications: Substation protection, transmission line safety, industrial power distribution
• Velocity: Very slow operation
• Weight: 1 lb
• Section: Fuse refills