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- **Features**:
- High heat resistance: Operating temperature range -40°C to +125°C
- Dual-channel SPDT (1 Form C × 2) contact configuration; supports H-bridge and independent configurations
- High contact current-carrying capacity: 25A (continuous), 35A (2 min @ 25°C), 40A (2 min @ 25°C, EP2F series)
- Silver oxide complex alloy contact material (Contact L/N type)
- Available in sealed (S) and unsealed versions
- Suitable for reversible control of motors and solenoids
- Unique structure enables high performance and high production efficiency
- Flux-tight housing
Technical Specifications
- **Contact Configuration**: SPDT (1 Form C) × 2 (H-bridge or independent type)
- **Contact Material**: Silver oxide complex alloy (L/N type)
- **Contact Resistance**: 50 mΩ max. (initial value, measured at 7A)
- **Contact Switching Voltage**: 16 VDC max.
- **Contact Switching Current**: 25 A max.
- **Contact Current-Carrying Capacity**: 25 A (continuous), 35 A (2 min max. @ 12VDC @ 25°C), 30 A (2 min max. @ 12VDC @ 85°C), 25 A (2 min max. @ 12VDC @ 125°C)
- **Coil Rated Voltage**: 12 VDC
- **Coil Resistance**: 225 Ω ±10%
- **Must Operate Voltage**: 6.5 VDC max.
- **Must Release Voltage**: 0.9 VDC min.
- **Rated Operating Power**: 0.64 W (@ 12VDC)
- **Operate Time**: Approx. 5 ms (@ 12 VDC, excluding bounce)
- **Release time**: Approx. 2 ms (@ 12 VDC, excluding bounce)
- **Insulation resistance**: 100 MΩ min. (@ 500 VDC, initial value)
- **Dielectric strength**: 500 VAC min. (1 minute, initial value)
- **Shock resistance**: 98 m/s² min. (malfunction)
- **Vibration resistance**: 10–300 Hz, 43 m/s² min. (malfunction)
- **Operating temperature range**: -40°C to +125°C
- **Coil temperature rise**: 50°C/W (no contact load current)
- **Mechanical life**: 1 × 10⁶ operations (no load)
- **Electrical life**: 1 × 10⁵ operations (@ 14 VDC, motor load 25 A/7 A @ 25°C); 1 × 10⁵ operations (@ 14 VDC, motor load 18 A/5 A @ 125°C)
- **Weight**: Approx. 15 g (EP2F series), approx. 8 g (EP1F series)
- **Mounting method**: Through-hole mounting
Notes
- **Compatibility**: Please verify that the relay is compatible with your application before purchasing. - Package Compatibility: 10-pin through-hole mount; verify PCB mounting hole locations and pin pitch.
- Coil Voltage: 12VDC; ensure control circuit voltage matches.
- Contact Current: Select based on actual load current; 25A continuous rating, with peak capacity of 35A–40A.
- Operate/Release Voltage: Max. operate voltage 6.5V; min. release voltage 0.9V.
- Sealing Type: Suffix "S" indicates sealed type; no "S" indicates unsealed (standard) type.
- H-Bridge Application: Drive interval between Tr1 and Tr2 must exceed 100 ms to prevent contact damage due to overcurrent.
- **Installation Instructions**:
- Ensure power supply voltage matches relay coil specifications (12VDC).
- Use appropriate decoupling capacitors to minimize coil switching noise.
- Operate within the specified temperature range (-40°C to +125°C).
- In H-bridge configurations, ensure the switching interval between Tr1 and Tr2 exceeds 100 ms.
- Control temperature and duration during soldering to avoid damaging the relay's internal structure.
- **Troubleshooting**:
- Relay fails to operate: Check if coil supply voltage is ≥6.5V; measure coil resistance (approx. 225Ω).
- Contact sticking: Check if load current exceeds rated values or if there is arc damage.
- Poor contact: Check if contact resistance exceeds 50mΩ or if oxidation/ablation is present.
- Malfunction: Verify vibration/shock resistance requirements are met and mounting is secure.
- **Alternative Model References**:
- EP2F-B3G1ST (G-type contact material, sealed)
- EP2F-B3L1ST (L-type contact material, sealed)
- EP2F-B3N1ST (N-type contact material, sealed)
- EP2F-B3G1T (Unsealed)
- EP1F Series (Single-channel version)
- **Technical Support**: For further technical support, it is recommended to contact KEMET/NEC or a professional automotive electronics repair service.
Summary
The EP2F-B3N1ST is a high-performance automotive relay manufactured by NEC (now KEMET). It features a dual-channel SPDT contact configuration and supports both H-bridge and independent circuit setups. Its high thermal resistance (-40°C to +125°C), high contact current-carrying capacity (25A continuous; 35A–40A peak), and silver-oxide composite alloy contacts make it an excellent choice for automotive motor control applications, such as power windows, sunroofs, and wiper systems. Widely used in automotive electronic systems—including the BMW FRM3 module and body control modules for PSA (Peugeot, Citroën, Fiat, Renault) vehicles—this relay is a common wear item in automotive electronics repair. When performing repairs, attention must be paid to coil voltage matching, contact current-carrying capacity, H-bridge driving timing, and the selection of the correct sealing type to ensure long-term reliability after replacement.
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