Physical fit and ratings
This is an external frontal rotary handle for the TeSys GS range, rated for switch currents of 32 A, 50 A, and 63 A. The IP65 enclosure rating means it's suitable for washdown or dusty environments. The handle is lockable in the O (off) position for lockout/tagout compliance.
Comparison with GS2AHT530 and GS2AHT520
The GS2AHT530 is the same external frontal handle design but rated for higher switch currents (100 A to 400 A) — it will not physically fit a GS switch base rated below 100 A. The GS2AHT520 is identical in current rating (32 A, 50 A, 63 A) but has a red handle and yellow front plate, which may be preferred for emergency-stop visibility. Neither is a direct functional replacement for the GS2AHT510; the handle colour and current range are the decision drivers.