The utility model provides an overload protection device switching value contact capability test appearance, including CPU module, man-machine interface (HMI), switching value input buffer circuit, switch quantity output buffer circuit, IRIG-B decoding circuit and power supply circuit. The input port of CPU module is connected with the input test terminal through switching value input buffer circuit, and output port is connected with the output test end through switch quantity output buffer circuit. IRIG-B decoding circuit and man-machine interface are connected with the CPU module respectively. The utility model discloses an in the acceptable transformer substation of tester the GPS clock synchronization device the IRIG-B sign indicating number to the time, can go on conventional opening the quantitative change bit test, correctly simulate SOE and experimental and realize the while testing of multichannel export contact, easy operation, convenient to use have improved the efficiency of overload protection device switching value test greatly.