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This Pololu high-power motor driver is a compact carriers board for the VNH3SP30 motor driver integrated circuits from ST. The board incorporates most of the components of the typical application diagram on page 8 of the VNH3SP30 datasheet, including pull-up and current-limiting resistors and a FET for reverse battery protection (Only the VNH2SP30 and VNH5019 supports current sense; the current sense circuit might not be populated on the VNH3SP30 version of the board). All you need to add is a microcontroller or other control circuit to turn the H-Bridge on and off.
In a typical application, the motor power supply is connected at the bottom of the board, the motor on the right side of the board, and the control connections to the left side of the board. The diagnostic pins can be left disconnected if you do not want to monitor the fault conditions of the motor driver chip. INA and INB control the direction of the motor, and the PWM pin turns the motor on or off. The current sense (CS) pin will output approximately 0.13V per amp of output current.