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Valad SCR controls are of the zero voltage fired type (eliminate radio noise).

Vibration tested I/A/W MIL-STD-167-1.
Sub-Section Three/Remote Solid State (SCR) Ventilation Duct Heater
Unit of Measure
Items
SCR
Remote Solid State (SCR) Control Panels
Amperage Ratings N/A 30 A60 A100 A
Voltage N/A 120 V220 V240 V440 V480 V
Phase N/A 1 PH 3 PH
Components Available N/A Fan interlock Fusing Step down transformers Temperature controller Terminal blocks for remote connections Thermocouple feedback Through the cover disconnect switch
Construction N/A 16 GA 302/304 stainless steel control box Cover hold down straps Gasketed for water tightness NEMA 4 rated Mounting Holes Provided
Certifications N/A I/A/W MIL-STD-167-1