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DC Controllers: Curtis Instruments

The speed controller is crucial to the efficiency and smooth operation of the electric car. Curtis was the first company to bring the resources of large scale manufacturing to controllers for road-going conversions, and they are still the largest manufacturer in the market. With the thousands of controllers they produce for vehicle manufacturers, from handicapped carts to delivery trucks, they are able to perfect the controller technology and the manufacturing process. This ensures consistent quality, performance, and factory support.

There are two models that are appropriate for road-going conversions. These are rated for the voltage and amperage ranges specifically suited to typical daily driving, to provide a balance of performance and range.

Curtis controllers and potbox
Clockwise from left:
Model 1231, Model 1221, PB-6 Potbox

The units are compact, easy to install, and completely sealed and weather-proofed. They require no additional cooling beyond normal airflow. These controllers heatsink through their base.

They are designed to be used in conjunction with the Curtis PB-6 potbox. When properly wired with the potbox, they provide many built-in safety features, including:

Specifications

Standard Model #1221C-7401

Physical
LengthWidthHeightWeight
10.90"7.1"3.2"10.8 lbs.

Input
Throttle
Control
Battery PackLow Voltage
Cutback
0 - 5 kohm72 - 120 V48 V

Output
Current Limit Frequency of
Operation
Voltage Drop
@ 100 Amps
2 Minute5 MinuteContinuous
400 A250 A150 A15 kHz 0.50 V

High Performance Model #1231C-8601

Physical
LengthWidthHeightWeight
12.2"6.9"3.2"15.8 lbs.

Input
Throttle
Control
Battery PackLow Voltage
Cutback
0 - 5 kohm96 - 144 V65 V

Output
Current Limit Frequency of
Operation
Voltage Drop
@ 100 Amps
2 Minute5 MinuteContinuous
500 A375 A225 A15 kHz0.30 V

Returns accepted for warranty issues ONLY, for replacement. No cash refunds.
For ordering and warranty information, see the Order Info page.

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