Hella 12V Relay 931680017 SPDT 40A Automatic DIN Rail Mount

Description

Product Overview

The Hella 931680017 12 V SPDT relay is a precision‑engineered component designed to meet the demanding electrical requirements of modern automotive and industrial systems. With a maximum switching current of 40 A and a coil voltage of 12 V, it provides a robust solution for power distribution, lighting control, and auxiliary device activation. The relay’s normally‑open contact configuration ensures that circuits remain open until the coil is energized, delivering reliable performance in safety‑critical applications. Its compact dimensions of 14.37 × 11.61 × 6.89 inches allow easy integration into tight engine bays or control panels, while the machined exterior offers superior heat dissipation. The copper alloy contacts are engineered for low resistance and long life, reducing wear even under frequent cycling. Designed for both DIN‑rail and panel mounting, the unit can be secured quickly with standard hardware, simplifying assembly and maintenance. Hella’s reputation for quality manufacturing guarantees that each relay conforms to rigorous industry standards, providing confidence to engineers and technicians who rely on consistent operation under harsh temperature and vibration conditions.

The relay’s internal construction relies on a high‑conductivity copper alloy for the contact plates, delivering low contact resistance and minimizing voltage drop during operation. The coil is wound with enamel‑coated wire to ensure consistent inductance and reduce the risk of short circuits. Rated for a continuous current of 40 A and a peak switching current of the same magnitude, the device can handle the surge currents typical of starter motors, fuel pumps, and high‑intensity lighting arrays. The enclosure is fabricated from a machined metal housing that provides both mechanical strength and electromagnetic shielding, protecting the contacts from external interference and dust ingress.

Compliance with industry standards is built into the design of the Hella 931680017 relay. The product meets the specifications commonly required for automotive performance electrical system relays, as reflected in its best‑seller ranking within the category. It is RoHS and REACH compliant, ensuring that hazardous substances are limited to acceptable levels for environmentally conscious applications. The relay is also tested for vibration resistance, temperature cycling from –40 °C to +125 °C, and humidity exposure, guaranteeing reliable operation throughout the vehicle’s service life. The manufacturer’s part number 931680017 and UPC 760687017363 provide traceability for inventory management and warranty support.

Usage

In passenger vehicles, the 12 V SPDT relay is frequently employed to control exterior lighting such as fog lamps, auxiliary headlights, and interior dome lights, where precise on/off switching is essential. Its normally‑open contacts keep the lighting circuits off until the driver activates the corresponding switch, preventing unnecessary power draw and extending battery life. The relay’s fast response time ensures that lights illuminate instantly, meeting safety regulations for visibility. Additionally, the device can be used to drive electric seat heaters, power windows, and door lock actuators, where the 40 A rating provides a safety margin for peak current demands.

In commercial and industrial settings, the same relay finds application in control panels for HVAC systems, conveyor belts, and automated manufacturing equipment. The ability to mount the unit on a DIN rail simplifies wiring in standard control cabinets, while the panel‑mount option offers flexibility for custom enclosures. Engineers appreciate the relay’s automatic operation mode, which eliminates the need for external timing circuits and reduces overall system complexity. The 12 V coil voltage aligns with common low‑voltage control circuits, allowing seamless integration with programmable logic controllers (PLCs) and sensor networks.

Installation of the Hella relay is straightforward for technicians familiar with standard automotive or industrial wiring practices. The three terminals—coil, common, and normally‑open—are clearly labeled on the housing, and the pin layout matches the widely used 5‑pin connector standard, enabling quick plug‑in connections. When mounting on a DIN rail, the built‑in clips snap securely into place, and a simple screwdriver can tighten the terminal screws for a solid electrical bond. For panel mounting, pre‑drilled holes accommodate the mounting brackets, and the compact size leaves ample room for adjacent components, reducing the risk of overheating due to cramped layouts.

Why Choose Us

Choosing Hella as the supplier for this relay brings the advantage of decades of experience in automotive component manufacturing. The brand’s commitment to precision engineering translates into tight tolerances, consistent performance, and a low failure rate that is reflected in the 4.8‑star rating from verified customers. Each relay undergoes rigorous quality control testing, including electrical endurance cycles and environmental stress screening, before it leaves the factory. This systematic approach ensures that the product not only meets but often exceeds the expectations of OEMs and aftermarket installers alike.

Beyond the product itself, Hella offers comprehensive after‑sales support, including technical documentation, wiring diagrams, and a dedicated customer service line staffed by engineers familiar with the relay’s specifications. Replacement parts are readily available through authorized distributors, and the manufacturer provides a clear warranty policy that covers defects in materials and workmanship for a defined period. For fleet operators and service centers, this support structure reduces downtime and simplifies maintenance planning, delivering tangible cost savings over the lifecycle of the equipment.

The relay is also designed with environmental responsibility in mind. Its compliance with RoHS and REACH directives means that it contains no lead, mercury, or other restricted substances, making it suitable for use in regions with strict ecological regulations. The durable metal housing is recyclable, and the efficient design minimizes energy loss, contributing to lower overall power consumption. By selecting a product that aligns with sustainable practices, customers can demonstrate their commitment to green initiatives while still benefiting from high‑performance electrical control.

Key Features

• High current capacity of 40 A ensures reliable operation for demanding automotive and industrial loads.
• Copper alloy contacts provide low resistance and long service life even with frequent switching cycles.
• Compact DIN‑rail and panel‑mount design simplifies installation in tight engine bays and control cabinets.
• Automatic operation eliminates the need for external timing components, reducing system complexity and wiring.
• Comprehensive after‑sales support and warranty give peace of mind and quick resolution of any issues.

FAQ

What type of vehicle electrical systems is this relay compatible with?

The Hella 931680017 relay is designed for standard 12 V automotive electrical systems, which are used in most passenger cars, light trucks, and many commercial vehicles. It works seamlessly with lighting circuits, power accessories, and control modules that operate at 12 V, providing a safe and reliable switching solution for both OEM and aftermarket installations.

How do I install the relay on a DIN rail?

Installation on a DIN rail is straightforward. First, ensure the rail is clean and free of debris. Align the relay’s built‑in mounting clips with the rail slots, then press the unit firmly until the clips snap into place. After securing the relay, connect the coil and contact wires to the labeled terminals using appropriate crimp connectors or screw terminals, and verify polarity before powering the system.

Can the relay handle surge currents from starter motors?

Yes, the relay’s 40 A rating covers both continuous and peak currents typical of starter motor activation and other high‑draw accessories. The copper alloy contacts are engineered to tolerate short‑duration surge currents without welding or excessive wear, making the device suitable for applications where occasional high‑current spikes occur.

What warranty coverage does Hella provide for this relay?

Hella offers a standard limited warranty that covers defects in materials and workmanship for a period of twelve months from the date of purchase. The warranty includes repair or replacement of faulty units, and customers can access technical support through Hella’s authorized service channels for assistance with troubleshooting or part replacement.