Time Delay Dive Fuse, 250 V, 45A

DiversiTech 7-CRNR45 – 45A Dual-Element Time Delay Fuse, Class RK5

The DiversiTech 7-CRNR45 is a 45-amp, 250-volt, dual-element time delay fuse designed for HVAC and industrial circuit protection. Classified as a UL Class RK5 fuse, it provides circuit protection where moderate inrush current tolerance is required—commonly for motor loads and inductive equipment such as air conditioning compressors and pump motors.

This fuse utilizes a dual-element design, incorporating both long-time delay for transient overloads and short-circuit interruption capabilities. It is suitable for both branch circuit protection and disconnect switch applications where Class RK5 fusing is specified.

Product Features

• ✅ Amperage Rating: 45A – Supports moderate-load motor and compressor circuits.
• ✅ Voltage Rating: 250 VAC – Rated for standard residential and commercial electrical systems.
• ✅ Interrupting Capacity: 200,000 A RMS Symmetrical – Provides current-limiting performance under high fault conditions.
• ✅ Class: RK5 – Complies with UL 248-12 for low-voltage fuses with current-limiting action.
• ✅ Element Type: Dual – Handles short-term overloads while protecting against sustained faults.

Technical Specifications

• Model: 7-CRNR45
• Nominal Voltage: 250 VAC
• Amperage: 45 Amps
• Interrupt Rating: 200 kA RMS Symmetrical
• Fuse Class: RK5 (UL Listed)
• Construction: Current-limiting cartridge fuse with time-delay elements

Installation Requirements

Installation must be performed by a qualified electrician. Ensure fuse compatibility with the disconnect or fuse block (Class RK5). Verify correct amperage rating for the protected load and inspect terminals for secure, corrosion-free contact. Use in accordance with NEC guidelines and equipment manufacturer specifications. Install with appropriate PPE and under de-energized conditions.

Application Scope

Typically used in motor protection circuits, disconnect switches, and HVAC equipment requiring time-delay fuse protection. Effective in systems where nuisance tripping due to motor inrush must be avoided while maintaining short-circuit protection. Suitable for air handlers, condensers, and small pump motors.