Overview
The Bussmann KTS-R-250 is a Class RK1 Limitron fast-acting fuse designed for industrial and commercial electrical systems requiring robust overcurrent protection. This 250-ampere, 600-volt rated fuse delivers a 200kA interrupting rating, making it compliant with NEC Section 110.9 for high-capacity systems. The fast-acting, current-limiting design helps prevent equipment damage caused by ground faults and short-circuit events.
Key Features
- Fast-Acting, Current-Limiting: Provides rapid response to fault conditions with 10X better current limitation than standard fuses.
- 200kA Interrupting Rating: Meets NEC Section 110.9 requirements for modern large-capacity electrical systems.
- Class RK1 Rejection Style: Incorporates rejection feature to prevent misapplication and ensure proper fuse compatibility.
- Non-Indicating Design: Blade end terminals for panelboard applications; melamine glass tube construction.
- Industrial Grade Construction: 70/30 brass end caps with robust electrical performance under fault conditions.
Technical Specifications
- Fuse Rating: 250 A (amperes)
- Voltage Rating: 600 Vac (nominal; 600 V or less)
- Interrupting Rating: 200 kA RMS (symmetrical) at 600 Vac
- Fuse Class: Class RK1 (UL 248-12)
- Operating Characteristics: Fast-acting, single-element
- Terminal Type: Blade end × blade end (rejection style)
- Body Construction: Melamine glass tube, 2″ diameter × 11.63″ length
- End Caps: 70/30 brass
- Indication: Non-indicating
- Series: Limitron KTS-R
- Certifications: UL Listed (Standard 248-12, Guide JDDZ, File E4273); CSA Certified
Typical Applications
The KTS-R-250 is ideal for:
- Industrial panelboards and distribution equipment
- High-fault-current circuits requiring current limitation
- Commercial power systems at 600V nominal
- Equipment requiring fast-acting overcurrent protection with equipment damage prevention
- Systems where Class RK1 selectivity and rejection features are required
Compatibility & Replacements
Compatible With
- Class RK1-rated fuse holders and blocks (rejection style)
- Standard 600V industrial electrical panels and distribution systems
- Equipment designed for blade-end fuse cartridges
- NEC-compliant overcurrent protection circuits
Replaces / Drop-In Replacement For
Verify compatibility with your system integrator or equipment manufacturer before ordering. The KTS-R-250 is a direct replacement for original Bussmann KTS-R-250 units and compatible with other Class RK1 fuse holders rated for 250A.
Works With
- Bussmann Class RK1 fuse blocks and holders
- Industrial panelboards accepting blade-end rejection-style fuses
- Standard UL-listed fuse rejection systems (Class RK1)
