WM-A10 - Thumb Throttle Switch

Product Brand: Williams Controls

The WM-A10 provides an electronic thumb throttle and switch solution for a wide range of applications including All-Terrain Vehicles (ATV) or Personal Recreational Vehicles (PRV)

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  • Non-contacting throttle with Hall-effect switches
  • Dual-redundant-output throttle signals
  • Up to two return-to-center, 3-position switches
  • Safety assured: each throttle circuit has dedicated 5V and ground supply connections
  • Switch circuits powered by third set of 5V and ground supply connections
  • Up to 4 LEDs for driver indication
  • Integrated connector or flying lead
  • Environmentally sealed to IP67
  • Custom tooling service for a wide range of applications

The WM-A10 provides an electronic thumb throttle and switch solution for a wide range of applications, including All-Terrain Vehicles (ATV) or Personal Recreational Vehicles (PRV).

The throttle utilizes two fully independent, non-contacting Hall-effect sensors to provide a dual-redundant-output architecture. The second signal is a fixed relation to the primary drive signal. Therefore, a vehicle’s Electronic Control Unit (ECU) can perform comparisons between the throttle’s two outputs to ensure it is operating correctly. Both outputs are linear and are directly proportional to absolute sensor shaft rotation. In addition, each throttle sensor circuit has its own 5V and ground supply connections, thereby implementing a truly dual-redundant system.

Non-contacting sensing is also employed in the design of the switches, which are momentary, center-off types and typically used to operate functions such as transmission shifting. Each switch has two outputs at 5V in the center position, with one or the other switching to the ground-dependent left or right operations. To provide a further level of safety, the switch circuits have a third set of 5V and ground supply connections.

The design of the WM-A10 means it is exceptionally robust against many different environmental conditions, including water immersion, pressure washing, salt spray, a variety of chemicals, dust, and mud, while connection to the unit is via an industry-stand integrated connector or flying lead.

In addition to the control inputs, the throttle unit can house up to four LEDs, which can indicate the status of vehicle functions to the driver.

The unit illustrated above is based on a customer-specific design. Still, Curtiss-Wright’s teams of experienced engineers are on hand to provide a custom service to meet the individual requirements of vehicle OEMs. Please contact your Curtiss-Wright representative for further details.

Throttle Switch: Purpose

A throttle switch is also known as a throttle position sensor and monitors the air intake of an engine. It is typically located on the spindle or shaft to observe the position of the throttle directly.


What does a throttle switch do?

A throttle switch informs the engine control unit about the throttle valve position to adjust the mixture and ignition. They determine the throttle valve position and are mounted directly on the throttle valve shaft. The various switch positions are transmitted to the engine management control unit to assist in the calculation of the required fuel quantity. The throttle valve switch features two switches which are actuated using a switching mechanism. 

Why is a throttle switch necessary?

The engine control module relies on the throttle switch to monitor the amount of fuel needed or time the ignition effectively. Without this feature, it can be hazardous for the driver and other road users.

WM-A10 - Thumb Throttle Switch