Hoyt HST-75 2.5-inch Analog AC Ammeter, 150 A

Hoyt Meter’s HST-75 series uses a compact 2.5-inch rectangular analog format with a clear black knife-edge pointer for at-a-glance monitoring at the electrical panel. This AC ammeter displays a 0–150 amp scale from a 5 amp input and requires an external 150:5 A current transformer; it does not measure the high-current conductor directly. The scaled meter-and-CT arrangement makes it suitable for monitoring generator output, shore-power feeds, and other AC branch or main circuits where the panel meter must remain isolated from the full measured current. Confirm the transformer ratio and conductor routing before installation so the displayed value matches the circuit. Common Ground Marine also supplies select HST configurations with custom ranges and scales for specialized marine panel applications.