The automatic transfer switch controller is the core control unit of a dual-power automatic transfer switch. It can reliably detect the voltage, frequency, phase loss, over/under voltage, and other statuses of the two power supplies, and monitor the switch body’s closing and opening positions and auxiliary contact feedback in real time. It can accurately determine whether the switch has executed the switching command, whether it is in position, and whether there is any jamming or malfunction. Electrical interlocking and logical judgment ensure safe and reliable switching. When the main power supply is abnormal, it automatically switches to the backup power supply and automatically switches back to the backup power supply after the main power supply is restored. It has self-testing, alarm, and protection functions, providing stable and reliable control and detection guarantees for continuous power supply.

ATS Controller Function and Parameter Comparison Table in LVMA
Product Pictures
Controller type	Y-700N	Y-703N	Y701B
Controller Installation
Installation method	Embedded installation (Mounted on panel door)
Connection mode	Terminal block	Terminal block + Customized cables
Out line dimensions W*L*H	211*155*55	170*126*56	150*122*62
Hole size W*L	186*141	150*111	130*111
Characteristics Overview-Control Circuit
Compatible switch types	ACB/MCCB/MTS/ATS	MCCB/MTS/ATS	MCCB/MTS/ATS
Output ports/Number	7: Programmable (pulse signal or continuous model)	3(Fixed)+3(Programmable)	3(Fixed)
Input ports/Number	6/Dry Contact Input/Programmable	6/Dry Contact Input/Programmable	4/Fixed
Rated operating voltage Ue	230/400V	230/400V	230/400V
Rated insulation voltage Ui	800V	800V	800V
Reference voltage for power detection Un	220/380V	220/380V	220/380V
Controller(Min./Max.)	70 ~ 120%Ue	70 ~ 120%Ue	70 ~ 120%Ue
Operating voltage range（V）
Operating voltage range(V)	Phase voltage 161 ~277	Phase voltage  161 ~277	Phase voltage  161 ~277
	Line voltage  280 ~480	Line voltage  280 ~480	Line voltage  280 ~480
Max.phase voltage of control power Us（V）	Phase voltage  277	Phase voltage  277	Phase voltage  277
Max.measured line voltage of control power Us(v)	Line voltage  660	Line voltage  480	Line voltage  480
Rated operating frequency	Adaptive 50/60Hz	Adaptive  50/60Hz	Adaptive  50/60Hz
Applicable Grounding System	IT/TN-C/TN-S/TT	TN-C/TN-S/TT	TN-C/TN-S/TT
Detection power（3-Phase products）	Common 3 P/Standby 3 P	Common 3 P/Standby 3 P	Common 3 P/Standby 3 P
Detection power（1-Phase products）	Common 1 P/Standby 1 P	Common 1 P/Standby 1 P	Common 1 P/Standby 1 P
Voltage loss judgment value	≤30% Ue	≤30% Ue	≤30% Ue
Phase Failure Transfer
Detection power（3-Phase products）	Common 3 P/Standby 3 P	Common 3 P/Standby 3 P	Common 3 P/Standby 3 P
Detection power（1-Phase products）	Common 1 P/Standby 1 P	Common 1 P/Standby 1 P	Common 1 P/Standby 1 P
Phase failure judgment value (any phase)	≤50V	≤50V	≤50V
Voltage loss and phase failure recovery Rated voltage Ue 230V,including 220V	85%	180V	180V
Voltage loss and phase failure recovery Rated voltage Ue 400V,including	85%	310V	310V
Under voltage Transfer
Detection power	Common 3 P/Standby 3 P	Common 3 P/Standby 3 P	Common 3 P/Standby 3 P
Under voltage setting range Rated voltage Ue 230V,including 220V	50-100%	100-200V	100-200V
Factory default value	80%Ue	165V	165V
Under voltage recovery value Rated voltage Ue 230V,including 220V	85%Ue	—	Under voltage value + 10-30V
		Default+10V	Default+10V
Over voltage Transfer
Detection power	Common 3 P/Standby 3 P	Common 3 P/Standby 3 P	Common 3 P/Standby 3 P
Over voltage setting range Rated voltage Ue 230V,including 220V	100-150%Ue	200V-300V	200V-300V
Factory default value	120%Ue	270V	270V
Over voltage recovery value Rated voltage Ue 230V,including 220V	115%Ue	—	Overv oltage value-10-30V
		Default-10V	Default-20V
Frequency Abnormality Transfer
Detection power	Common 3 P/Standby 3 P	Common 3 P/Standby 3 P	Common 3 P/Standby 3 P
Frequency abnormality setting range	0-70Hz	0-70Hz	Only detection