Original Bosch 0281003142 Heavy Duty Glow Plug Relay 12V DC 80A SPST Normally Open Preheating Control Relay

Product Specifications

• Brand: Genuine Bosch Original
• Part No.: 0281003142
• Cross Mercedes OE: A0005450413
• Cross Renault OE: 7700109049
• Cross Fiat OE: 46524531
• Cross Iveco OE: 504082509
• Coil Voltage: 12V DC
• Coil Resistance: 18Ω standard range
• Contact Type: SPST Single Pole Single Throw Normally Open Heavy Power
• Rated Current: 80A Normally Open Heavy Resistive Load
• Built-in Component: Internal surge absorption protection circuit
• Extra Feature: Integrated metal fixed mounting bracket
• Protection Grade: IP54 fully sealed anti-oil, dust & splash water
• Working Temperature: -40℃ ~ +125℃
• Housing: Large thick black reinforced flame retardant plastic, with metal mounting bracket
• Warranty: 12 Months Genuine Bosch Factory Warranty

Core Electrical & Mechanical Specifications

1. Nominal Coil Voltage: DC 12V
2. Continuous Contact Load: 80A @12V DC Normally Open heavy load
3. Coil DC Resistance: 18Ω
4. Mechanical Service Life: ≥5,000,000 operations
5. Electrical Service Life: ≥100,000 cycles under full 80A rated resistive load
6. Standard 4-Terminal Definition: 30 Main Input, 87 NO Output, 85 Coil-, 86 Coil+
7. Housing Dimension: Large heavy-duty power relay size, integrated metal mounting ear
8. Vibration Resistance: Engine heavy-duty vehicle industrial standard
9. Terminal Protection: IP20

Compatible Equipment 

Applicable 12V Heavy-Current Equipment

Mercedes, Renault, Fiat, Iveco all series 12V diesel cars & light vans, mini diesel excavators, wheel loaders, marine 12V diesel auxiliary engines, small stationary silent 12V diesel generators

Wide Application Range

1. OEM matching heavy-duty glow plug relay spare part for European 12V diesel vehicles and small 12V diesel generators, dedicated preheating system control for cold startup
2. Direct replacement for failed original 0281003142 OEM relay: diesel vehicle hard cold start, preheating light malfunction, ECU surge burnout
3. Universal core stock for diesel vehicle special repair shops and small diesel generator rental companies for daily 12V diesel equipment preheating circuit overhaul
4. High-current electrical system upgrade retrofit for custom 12V diesel machinery, providing stable 80A single-path heavy-load switching protection with built-in anti-surge circuit and metal fixed bracket

Common Equipment Failures Solved

• Cheap generic relays without surge protection cause glow plug inductive back voltage to burn vehicle ECU and preheating control units
• Thin contacts of low-current relays melt and stick under long-time glow plug energization, leading to no cold start or continuous glow plug burnout
• Inferior plastic housing deforms and cracks under high engine temperature, coil short circuit causing preheating system failure
• Mismatched 24V relays burn coil instantly after power supply, preheating system completely invalid
• Original Bosch 0281003142 heavy-duty glow plug relay damaged, direct replacement without circuit modification
• 12V diesel vehicles require dedicated high-current SPST glow plug relay; small 30A mini relays cannot withstand glow plug large inrush current