Cooper Bussmann ECSR100 100A 600V Class RK5 Fuse

Product Description

The COOPER BUSSMANN ECSR100 is a 100-amp, 600-volt time-delay, dual-element, current-limiting fuse rated Class RK5. It is engineered for superior overload and cycling performance, making it well suited for motor branch circuit protection where nuisance tripping is a concern. The dual-element design allows the fuse to tolerate motor inrush current and other temporary overloads while still providing fast, reliable response to short-circuit faults. With a 200 kAIC interrupting rating and a 10-second withstand at 500 percent of rated current, this fuse handles demanding load profiles common in commercial and industrial electrical systems. Licensed electricians and industrial maintenance technicians are the primary installers.

The ECSR100 is used in motor circuit and feeder protection applications across residential, commercial, and light industrial settings. Its blade-end-by-blade-end construction fits standard Class RK5 fuseholders and disconnect switches rated for 600-volt service. It is particularly common in HVAC equipment disconnects, compressor circuits, and panel feeder protection where time-delay characteristics help manage motor starting loads. The non-indicating design is standard for this fuse class.

Key Features

• 100-amp continuous rating at 600 volts AC
• Time-delay dual-element design tolerates motor inrush and cycling loads
• 200 kAIC interrupting rating for high-fault-current environments
• 10-second withstand at 500 percent of rated current
• Class RK5 current-limiting classification with blade-end terminations
• Non-indicating, standard form factor for straightforward fuseholder installation

Compatibility

Designed as an OEM-style replacement for Class RK5 dual-element time-delay fuses in 600-volt fuseholders and disconnect switches rated for 100-amp service.

Installation Notes

Installation must be performed by a licensed electrician in accordance with the National Electrical Code (NEC) and applicable local codes. Always de-energize and lock out the circuit before removing or installing the fuse. Verify that the fuseholder is rated for Class RK5 fuses and is suitable for the voltage and amperage of the circuit. Do not replace with a fuse of a different class, voltage rating, or higher amperage than the original design specifies.

Technical Specifications

• Amperage: 100 A
• Voltage: 600 V
• Fuse Class: Class RK5
• Fuse Type: Time-delay, dual element, current-limiting
• Interrupting Rating: 200 kAIC
• Time-Delay Rating: 10 seconds at 500 percent of rated current
• Termination Style: Blade end x blade end
• Indicating: Non-indicating
• UPC: 782634508434

Standard Information

• Brand: COOPER BUSSMANN
• Manufacturer Part Number: ECSR100