Overview
The Shawmut OTS20 is a Class K5 one-time (fast-acting) power fuse designed for low-cost protection of feeder and branch circuits. Rated at 20A, 600VAC, the OTS20 interrupts faults up to 50,000 amperes, making it ideal for control circuits, solenoid loads, and non-inductive applications in residential and small commercial electrical systems. This lot includes two units for convenience in stock replacement.
Key Features
- Class K5 one-time (fast-acting) design for non-motor loads
- 50,000 AIC interrupting rating at 600VAC
- Ferrule-terminal construction for standard fuse blocks
- 300VDC rating with 20,000 AIC interrupting capacity
- Easy-to-read imprint label for quick identification
- UL and CSA certified for safety compliance
Technical Specifications
The OTS20 fuse meets rigorous industrial standards for protection and reliability:
- Amperage: 20A
- AC Voltage Rating: 600VAC
- DC Voltage Rating: 300VDC
- AC Interrupting Rating: 50,000 AIC @ 600VAC
- DC Interrupting Rating: 20,000 AIC @ 300VDC
- Fuse Class: K5
- Type: One-Time (Fast-Acting)
- Terminal Style: Ferrule (Cartridge)
- Physical Size: 13/16″ x 5″
- Approvals: UL, CSA, RoHS
Typical Applications
Shawmut OTS20 fuses are widely used in:
- Control circuits and terminal protection in panel-mounted equipment
- Solenoid and low-inductive load circuits
- Lighting and heating circuit branch protection
- Residential and small commercial electrical distribution systems
- Equipment requiring Class K5 fast-acting overcurrent protection
Compatibility & Replacements
Compatible With
- Standard K5 fuse blocks with ferrule terminals
- Box lug mounting systems (aluminum and copper rated #2–14)
- Screw connector fuse holders (copper rated #10–14)
- Electrical panels and distribution boards rated for 600VAC operation
Replaces / Drop-In Replacement For
- Ferraz Shawmut OTS20
- Mersen OTS20 (Ferraz Shawmut is now Mersen)
- Gould Shawmut OTS20
Works With
- Ferraz Shawmut fuse block and mounting hardware
- Class K5-rated electrical distribution and protection systems
- Standard U.S. industrial electrical panels and control enclosures
- AC and DC circuits up to their respective voltage ratings
