Product Description
The Bel Fuse Inc. MRT-250-AMMO is a radial, vertical-mounted cartridge-style fuse (board mount, not cartridge) tailored for through-hole PCB protection. It is a slow-blow (time-delay) fuse designed to tolerate transient surges while still protecting against sustained overcurrent. With a rated current of 0.25 A and voltage of 250 V AC, it offers a breaking capacity of up to 50 A at rated voltage. The device features a small form factor (8.35 mm diameter × 7.70 mm height) and cold resistance of about 0.55 Ω. It is qualified under multiple safety and regulatory standards, making it suitable for applications demanding reliable overcurrent protection with industry compliance.
Key Features & Specifications
Parameter |
Value |
|---|---|
| Manufacturer | Bel Fuse Inc. |
| Manufacturer Part Number | MRT-250-AMMO |
| Series | MRT |
| Fuse Type / Response | Slow-Blow (Time-Lag) |
| Rated Current | 250 mA |
| Rated Voltage (AC) | 250 VAC |
| Interrupting Rating (at rated voltage) | 50 A |
| Cold Resistance (typical) | 0.55 Ω |
| Operating Temperature Range | –55 °C to +125 °C |
| Dimensions (Diameter × Height) | 8.35 mm × 7.70 mm |
| Lead Spacing | 5.08 mm |
| Packaging | Ammo pack (tape & box) |
| Approvals / Certifications | AEC-Q200, CCC, CE, CSA, cURus, SEMKO, VDE |
| Status | Obsolete / discontinued |
Applications & Use-Cases
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Telecommunications equipment: Protecting power supplies and interface modules from overload
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Consumer electronics: In devices where inrush currents (e.g. motors, charging circuits) must be differentiated from faults
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Instrumentation & measurement: Protecting sensitive analog / digital front ends
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Industrial control systems: As a protective fuse in modular boards, PLCs, motor driver circuits
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Medical devices (non-implantable): Where board-level safety fusing is required under strict temperature and reliability constraints
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Power conversion / supply boards: In compact DC-AC or AC-DC converters where space and surge tolerance matter
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