W12T 40A Power Relay | PCB Relay for EV Charging & Photovoltaic Systems

Content

1 1. Product Features
2 2. Performance Parameters
3 3. Typical Application Areas
4 4. Why Choose the W12T Power Relay?
5 5. Summary

W12T is a 40A power relay launched by FANHAR Electronics, designed for high-power power control applications such as electric vehicles, charging piles, and photovoltaic (PV) renewable energy systems. The relay features a 40A contact switching capability, a maximum dielectric withstand voltage of 4000VAC between coil and contacts, and an optional contact gap of ≥2.1mm. While ensuring high-load switching performance, it also meets the requirements for electrical insulation and safety in new energy equipment. With a compact PCB-mount design, the W12T measures only 31.6 × 27.2 × 18.4 mm and is available in a wide range of coil voltage options to suit various equipment design needs. It is widely used in new energy power control systems.

1. Product Features

40A High-Current Switching Capability
The W12T has a rated control load of 40A 250VAC. The standard type supports 20A 30VDC DC loads, while the BG type supports 20A 48VDC DC loads. The maximum switching capacity reaches 10000VA, meeting the power control requirements of high-power equipment.

High Insulation Performance for Enhanced System Safety
To address the insulation requirements of new energy equipment, the W12T offers excellent electrical insulation:

Maximum dielectric withstand voltage between coil and contacts: 4000VAC

Dielectric withstand voltage between contacts (BG type): 2500VAC

Initial insulation resistance: 1000MΩ (at 500VDC)

Superior insulation performance contributes to improved operational safety and reliability.

Optional Contact Gap ≥2.1mm
The W12T BG type provides a contact gap of ≥2.1mm, complying with the European VDE0126 photovoltaic standard. This meets the demand for larger contact isolation distances in certain PV system applications.

High-Quality Contact Material
The W12T series uses AgSnO₂ (silver-tin oxide) as the contact material. AgSnO₂ exhibits excellent arc erosion resistance, low and stable contact resistance, good thermal conductivity, and outstanding anti-welding performance. It effectively reduces arcing and extends relay service life.

2. Performance Parameters

Wide Range of Coil Voltage Options
To accommodate diverse control system designs, the W12T is available in multiple coil voltages, including:
[Refer to the coil specification table in the original datasheet]

Standard type coil rated power: 900mW

BG type coil rated power: 1400mW

Stable and Reliable Mechanical and Electrical Performance
The W12T balances mechanical and electrical endurance, maintaining stable switching performance over long-term operation. Key performance indicators:

Mechanical life: 5 million operations

Electrical life:

40A 250VAC: 20,000 operations

20A 30VDC (standard type): 100,000 operations

20A 48VDC (BG type): 50,000 operations

Operate time (standard type): ≤15ms

Release time (standard type): ≤10ms

Operating temperature range: -40°C to +85°C, suitable for various industrial and new energy equipment applications.

Multiple Safety Approvals

The W12T has obtained several domestic and international product certifications, including:UL / cUL，TÜV，CQC

These certifications cover 40A AC load and 20A DC load applications, supporting product use in different markets.

3. Typical Application Areas

According to the product datasheet, the W12T is primarily used in:

Electric vehicles (EVs)

New energy vehicle charging piles

Photovoltaic (PV) renewable energy equipment

Its high current switching capability and insulation performance meet the power control requirements of the above applications.

4. Why Choose the W12T Power Relay?

As a 40A power relay designed for the new energy sector, the W12T combines high load capacity, insulation performance, and reliability. Key advantages include:

40A AC load switching capability

Up to 4000VAC dielectric withstand voltage between coil and contacts

Optional contact gap ≥2.1mm, compliant with VDE0126 PV standard

Wide range of coil voltages from 5V to 110VDC

UL Class F insulation system

Operating temperature range -40°C to +85°C

Certified by UL, TÜV, CQC, etc.

Suitable for electric vehicles, charging piles, photovoltaic, and other new energy applications

5. Summary

The W12T series power relay, with its 40A high-current switching capability, 4000V high insulation withstand voltage, contact gap design compliant with VDE0126 PV standard, Class F insulation, and AgSnO₂ high-quality contact material, has become an important component choice for EV charging piles and photovoltaic new energy systems. The product has passed multiple international certifications including UL, TÜV, and CQC, and is offered in both standard and BG types with a broad selection of coil voltages, meeting diverse requirements across various application scenarios.