Bosch 0332019150 Mini Relay 12V 30A, 2x87, IP5K4, Operating Temperature from -40 Degree to 100 Degree C, 5 Pin Relay with Relay bracket

Bosch 0332019150 Mini Relay

The Bosch 0332019150 Mini Relay is a compact, high‑performance switching device designed for automotive and industrial applications that require reliable control of up to 30 A at 12 V. Its small footprint, robust construction, and wide operating temperature range make it an ideal choice for engineers seeking dependable performance in demanding environments.

Key Technical Specifications

• Voltage Rating: 12 V DC
• Current Capacity: 30 A (continuous)
• Poles: 5 (including common, normally open, and normally closed contacts)
• Contact Type: Dual‑output (twin) with both normally open (NO) and normally closed (NC) configurations
• Coil Resistance: Typical 12 Ω (allowing low power consumption)
• Operating Temperature: –40 °C to +100 °C, ensuring performance in extreme climates
• IP Rating: IP5K4 – dust‑protected and splash‑proof for automotive environments
• Physical Dimensions: 30 mm × 20 mm × 15 mm (approx.) – suitable for tight spaces
• Mounting: Includes a standard plastic bracket for secure installation on panels or circuit boards
• Color & Finish: Black/grey paint, providing a neutral aesthetic that blends with most vehicle interiors and control panels

Functional Overview

The relay operates as a switching element, using an electromagnet to actuate the contacts. When 12 V is applied to the coil, the magnetic field pulls the armature, closing the NO contact and opening the NC contact (or vice versa depending on wiring). This action allows the relay to control high‑current loads such as headlights, wipers, or auxiliary power units while protecting sensitive electronics from voltage spikes.

Because it is a dual‑output device, the same coil can simultaneously drive two separate circuits. This feature reduces component count and wiring complexity in automotive dashboards, where multiple functions often share a single control signal.

Installation & Mounting

The relay comes with an integrated plastic bracket that simplifies mounting on vehicle panels or within electronic control units. The bracket’s design accommodates standard screw holes (M2 or M3) and provides a secure mechanical connection, preventing vibration‑induced failures.

Wiring is straightforward: connect the coil terminals to a 12 V source with appropriate gauge wire; route the load through the NO or NC contacts as required. The relay’s low coil resistance ensures minimal voltage drop across the control circuit.

Reliability & Durability

Bosch is renowned for its rigorous quality standards, and this mini relay reflects that heritage. Its IP5K4 rating protects against dust ingress while allowing splash protection from water or coolant leaks—common in automotive environments.

The wide temperature range of –40 °C to +100 °C guarantees operation in both cold climates (e.g., Arctic regions) and hot desert conditions. The robust plastic housing resists impact, vibration, and thermal expansion, extending the relay’s service life even under continuous duty cycles.

Typical Applications

• Vehicle Lighting: Control headlights, taillights, or interior lamps with a single coil.
• Wiper Systems: Switch between low and high speed wipers using the NO/NC contacts.
• Power Management: Isolate auxiliary power units (e.g., air conditioning compressors) from the main battery during startup.
• Industrial Automation: Use in control panels where space is limited but high current switching is required.
• Security Systems: Actuate alarm relays or door locks with a reliable, low‑power trigger.

Compatibility & Integration

The relay’s 5‑pin configuration aligns with standard automotive harnesses. It is compatible with most vehicle models that use Bosch components, including BMW, Audi, Volkswagen, and many others. The dual‑output design allows it to replace older single‑contact relays without redesigning the control logic.

Maintenance & Troubleshooting

Because the relay is sealed and protected, routine maintenance is minimal. If a circuit fails, inspect the coil for continuity and ensure that the contacts are not corroded or welded together. Replace the relay if the coil does not energize or if the contacts fail to open/close under load.

Conclusion

The Bosch 0332019150 Mini Relay combines compactness, high current handling, and robust environmental protection in a single package. Its dual‑output capability, wide temperature tolerance, and IP5K4 rating make it an excellent choice for automotive engineers and industrial designers who demand reliable switching performance in tight spaces.

Whether you are upgrading an existing vehicle system or designing a new control module from scratch, this relay offers the precision, durability, and versatility required to meet modern electrical standards.