MEF 004 RS Components Fuse (Other) In Stock
RS PRO MEF 004 is a 4A, 250V radial non-resettable wire-ended fuse designed for overcurrent protection in PCB and equipment applications. Features compact radial lead configuration for through-hole board mounting. Available from stock with worldwide shipping.
- Manufacturer
- RS Components
- Package
- Other
- Pin Count
- 2
- Lifecycle
- ACTIVE
- Datasheet
- MEF 004 Datasheet PDF
- Category
- Fuse
- RoHS
- Compliant
- Lead Time
- 3–7 business days
- Shipping
- DHL Express · Worldwide
Key Features
- 4A rated current and 250V voltage rating providing reliable overcurrent protection in a wide range of circuits
- Radial wire-ended lead form enabling direct through-hole PCB mounting without additional fuse holders
- Non-resettable single-use design ensuring fail-safe operation that requires deliberate component replacement after an overcurrent event
- Compact body size suitable for high-density PCB layouts requiring inline overcurrent protection in constrained spaces
Applications
The MEF 004 is used for overcurrent protection in PCB-mounted power supply circuits, industrial control equipment, home appliances, and consumer electronics operating at voltages up to 250V. Its 4A current rating makes it suitable for protecting transformer primaries, motor circuits, and power distribution wiring in equipment rated for mains voltage. The radial through-hole lead configuration allows it to be placed directly on a PCB without requiring a separate fuse holder, simplifying circuit board design.
Compliance & Regulatory
| RoHS Status | Compliant |
| Lead-Free | Yes (Pb-Free) |
Alternate & Equivalent Parts
No known alternates. Submit an RFQ and our team can suggest alternatives.
Frequently Asked Questions
What voltage and current ratings define the operating limits of the MEF 004 fuse?
The MEF 004 is rated at 4A continuous current and 250V maximum voltage. These ratings are suitable for protecting mains-connected circuits, transformer primaries, and AC power distribution lines in equipment operating at 120V or 230V mains, providing a safety margin below the 250V limit while clearing faults at 4A or above.
How does the radial wire-ended configuration of the MEF 004 simplify PCB integration compared to cartridge fuses?
The radial wire-ended design of the MEF 004 allows it to be inserted directly into a PCB through-hole without a separate fuse holder, reducing component count and board space. Cartridge fuses require a dedicated holder that adds at least 2 additional board positions; the MEF 004 needs only 2 through-holes at a lead pitch matching standard 5 mm or 7.5 mm grid spacing, simplifying layout and lowering BOM cost.
In which equipment categories is the MEF 004 typically used for circuit protection?
The MEF 004 at 4A, 250V is typically used in industrial power supplies, HVAC control boards, audio and lighting equipment, and white goods such as washing machines and dishwashers. Its non-resettable design ensures that after an overcurrent fault clears at 4A or above, a deliberate servicing action is required before the equipment can be re-energized, improving safety in mains-powered consumer and industrial products.
What does non-resettable mean for the MEF 004 and how does it affect maintenance?
Non-resettable means that the MEF 004 permanently opens its circuit element when the fault current exceeds 4A, and cannot be manually reset like a circuit breaker. Maintenance technicians must replace the MEF 004 fuse with a new 4A, 250V rated device after any overcurrent event. This single-use characteristic provides a clear audit trail of fault events and eliminates the risk of the protection device being inadvertently bypassed.
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