Bosch Relay 12V 5 Pin - OEM Number: 0986Ah0250

The Bosch Relay 12V 5 Pin (OEM 0986AH0250) is a genuine electromechanical switching relay designed for use in a wide range of automotive, commercial vehicle, agricultural, construction, and industrial electrical systems. The relay enables low-current control circuits to safely switch higher-current electrical loads, making it suitable for applications such as starter circuits, lighting systems, fuel pumps, cooling fans, horns, auxiliary equipment, and engine management systems.

Manufactured to Bosch's stringent OEM standards, this relay is engineered for reliable switching performance, long service life, and resistance to vibration, moisture, and temperature fluctuations commonly encountered in demanding operating environments.

FUNCTION AND OPERATION

• Allows low-current circuits to control higher-current loads
• Provides reliable switching of electrical components
• Helps protect switches and control circuits from excessive current draw
• Suitable for normally open and changeover circuit applications
• Supports automotive, plant, agricultural, and industrial electrical systems
• Designed for long-term reliability in harsh operating conditions

TECHNICAL DETAILS

• OEM Part Number: 0986AH0250
• Manufacturer: Bosch
• Type: Electromechanical changeover relay
• Operating Voltage: 12V DC
• Terminal Configuration: 5 Pin
• Function: Electrical load switching and circuit control
• Construction: Sealed relay housing with integrated mounting tab
• Design: OEM-configured direct replacement component
• Contact Arrangement: SPDT (Single Pole Double Throw) / Changeover relay
• Applications: Switching high-current electrical loads via low-current control circuits

Bosch relays of this type are commonly utilised across a broad range of OEM vehicle and machinery installations where dependable electrical switching is required.

TYPICAL APPLICATIONS

Suitable for a wide variety of equipment, including:

• Cars and light commercial vehicles
• Agricultural tractors and machinery
• Construction equipment
• Site dumpers and excavators
• Generators and power equipment
• Lighting systems
• Starter motor circuits
• Fuel pump control circuits
• Cooling fan systems
• Auxiliary electrical accessories

The relay's standard 5-pin configuration makes it suitable for numerous OEM and replacement electrical applications requiring a changeover contact arrangement.

IMPORTANT INFORMATION

Always confirm the correct OEM part number, voltage, terminal layout, current rating, and relay function before ordering, as relays with similar appearances may have different internal contact configurations and operating specifications. OEM 0986AH0250 is a 12V 5-pin changeover relay, and installing an incorrect relay may result in circuit malfunction, component damage, or intermittent electrical faults.

Common symptoms of a faulty relay include failure of the controlled component to operate, intermittent operation, clicking without switching, overheating, or excessive voltage drop across the contacts. When replacing a relay, it is advisable to inspect the relay socket, wiring harness, terminals, fuses, and associated electrical components for signs of corrosion, overheating, loose connections, or water ingress to ensure reliable long-term operation.

DELIVERY OPTIONS (UK mainland only)

Next Day Delivery*
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**Separate carriage charges apply to bulk products such as 205L barrels.