Overview
The Bussmann KTN-R-50 is a Class RK1 fast-acting current-limiting fuse rated for 50 A at 250 V AC. Part of the Bussmann Limitron family of rejection-style fuses, this cartridge-body unit provides reliable overcurrent and short-circuit protection for industrial control panels, motor circuits, and commercial power distribution systems. With a 200 kA interrupting rating, the KTN-R-50 handles high-fault current circuits at all circuit locations, making it suitable for critical electrical infrastructure.
Key Features
- Fast-Acting Response: Rapid trip on short circuits and ground faults without nuisance opening on inrush.
- 200 kA Interrupting Rating: Handles maximum fault currents in high-fault industrial environments.
- Class RK1 Current-Limiting: Provides Class RK1 current-limiting performance to protect downstream components.
- Rejection-Style Design: Prevents insertion of incorrect fuse types and ensures proper fit in Class RK1 holders.
- Melamine Glass Cartridge Body: Clear visibility of element and end caps for visual inspection.
- Non-Indicating: Standard non-indicating version; no melting indicator.
Technical Specifications
- Ampere Rating: 50 A
- Voltage Rating: 250 VAC (also 100 kA at 250 VDC)
- Interrupting Rating: 200 kA (symmetrical) at 250 VAC
- Fuse Class: RK1
- Speed: Fast-Acting
- Terminal Style: Ferrule with grooved ring (rejection-style)
- Body Type: Cartridge, melamine glass
- Dimensions: 0.56 in. diameter × 3 in. length (typical)
- Standards Compliance: UL 248-12, CSA C22.2/1422-02, CE marked
- Series: Bussmann Limitron KTN-R
Typical Applications
- Motor control circuits and feeder protection in industrial plants.
- Commercial panelboards and branch circuit protection.
- Power distribution systems with high-fault current potential.
- Control transformer and equipment branch circuits.
- General industrial and commercial electrical systems requiring Class RK1 protection.
Compatibility & Replacements
Compatible With
- Class RK1 fuse holders and rejection-style fuseholders.
- Panelboards and distribution equipment rated for Class RK1 cartridge fuses.
- Industrial control panels and motor control centers.
- Electrical systems operating at 250 VAC / 100 kA DC.
Replaces / Drop-In Replacement For
- Older or damaged KTN-R-50 units in existing installations.
- Compatible equivalent 50 A Class RK1 fast-acting fuses from legacy inventories.
- Verify part number and specifications with your system documentation before ordering.
Works With
- Class RK1-rated switchgear, panelboards, and motor control centers.
- UL-listed electrical distribution systems and industrial control equipment.
- Motor starters, contactors, and control transformers rated for Class RK1 protection.
