SurLok Connector-120A (Black) – Suits Nexus R3

SurLok Connector-120A (Black): High-Current Integrity for Nexus R3

In modern vehicle control systems, power delivery is as critical as data processing. The **SurLok Connector-120A (Black)** is a heavy-duty, locking power connector designed specifically for the high-current demands of the **Haltech Nexus R3** Vehicle Control Unit (VCU). Unlike standard ring terminals or spade connectors that can loosen under vibration or suffer from high resistance due to poor contact area, the SurLok system employs a robust, tool-free locking mechanism that ensures a secure, gas-tight connection. The black housing typically designates this connector for Ground (Negative) or specific low-side control applications within the Nexus ecosystem, helping builders maintain industry-standard color coding for safety and serviceability.

Engineering for Amperage

The SurLok connector is engineered to handle continuous currents of up to 120 Amps. This capability is essential for the Nexus R3, which often serves as a Power Distribution Module (PDM) driving high-load components like cooling fans, fuel pumps, and electric water pumps. The internal contact technology features a multi-point contact spring that maximizes surface area engagement with the mating pin. This design minimizes contact resistance, thereby reducing voltage drop and heat generation at the connection point—a critical factor when managing the thermal efficiency of a PDM. The connector housing is molded from high-impact, non-conductive polymer that provides IP67-rated environmental sealing when mated, protecting the terminal from moisture, dust, and engine bay fluids.

Operational Benefits

• Vibration Resistant: The positive locking latch prevents accidental disconnection, even in high-vibration motorsport environments like rally or off-road racing.
• Safety: The touch-proof design prevents accidental shorting during maintenance or installation.
• Low Resistance: Ensures that 120A flows with minimal loss, delivering maximum voltage to your starter, ground plane, or PDM input.
• Tool-Free Mating: Once the wire is crimped to the internal lug, the connection to the unit is quick and requires no tools, speeding up pit-lane service.

Fitment and Compatibility

This connector is specifically designed to interface with the **Haltech Nexus R3** unit. It is typically used for the main ground connection or high-current input/output terminals as designated by the Nexus R3 pinout.

• Device: Nexus R3 VCU
• Application: High-current Ground or Power connections (Check Nexus R3 Wiring Diagram).
• Wire Size: Compatible with 25mm² (4 AWG) to 35mm² (2 AWG) cable (Verify crimp lug size provided).

Technical Specifications

Summary & What’s Included

The HT-030033 SurLok Connector is a mandatory component for a professional Nexus R3 installation, ensuring your power delivery is as reliable as the ECU itself.

Includes:

• 1 x 120A Black SurLok Connector Housing
• 1 x Crimp Contact Lug

Note: Proper high-current crimping tools are required to terminate the cable to the contact lug safely. Do not rely on soldering alone for 120A connections.