There are Detectors for High-precision Detection of heater burnout , High-capacity (4 to 80 A AC) Detectors with built-in CTs, and Compact Plug-in Burnout Detectors with low capacities (0.5 to 4 A AC).
Voltage Detectors are available for detecting undervoltage and overvoltages for AC or DC power. AC and DC Voltage Detection Relays that can be operated and reset are also available.