Product Specifications	DCU8-W2	DCU8-W3	DCU9-W2	DCU-A	DCU-B	DCU-HA	DCU-HB
Dimensions and Installation Method	Snap-on or screw-fixed					Snap-on type
Power indicator	▲	▲	▲	▲	▲	▲	▲
Closing signal	▲	▲	▲	▲	▲	▲	▲
Adjustable delay	▲	▲	▲	▲	▲	▲	▲
Manual/automatic adjustable	▲	▲	▲	▲	▲	▲	▲
Primary and backup power sources are prioritized.	▲	▲	▲	▲	▲	▲	▲
Self-initiated and self-replied / Self-initiated but not self-replied adjustable	▲	▲	▲	▲	▲	▲	▲
Power failure detection	▲	▲	▲	▲	▲	▲	▲
Under-voltage detection(≤187V±2V)	▲	▲	▲	▲	▲	Adjustable	Adjustable
Overvoltage detection(≥264V±2V)	▲	▲	▲	▲	▲	Adjustable	Adjustable
Phase loss detection	▲	▲	▲	▲	▲	▲	▲
Generator function	▲	▲	▲		▲	▲	▲
Fire zero cut			▲			▲
Power failure output	▲	▲
Fault Record						▲	▲
Liquid crystal						▲	▲
RS485 Communication						▲	▲

DCU series controller terminal block diagram

Terminal Description:

K1, K2: Common power supply failure output, normally open contact, the contact is closed when common power supply fails, and the contact is open when normal;
K3, K4: standby power failure output, normally open contact, the contact is closed when the standby power fails, and the contact is open when it is normal;
F1, F, F2: generator start and shut down signals, F is the common point, F1 is the normally open point, and the main power supply is closed when it is normal; F2 is the normally closed point. When the main power supply is abnormal, it will close with a delay of about 3s;
R1, R2: fire control input. When the fire control center provides a passive signal, short-circuit the R1R2 contact on the controller, which can force the switch to switch to the double-division position and cut off the load; When the fire signal is cancelled, the switch automatically switches;
Refer to the controller and switch wiring diagram for the remaining terminals.

DCU-HA Controller Block Diagram

Terminal Description:

A +, B-: RS485 communication interface;
D1, D2: switch trip input;
F1, F, F2: generator start and shut-off signals, F is the common point, F1 is the normally open point, F2 is the normally closed point, F, F2 are closed when the main power supply is abnormal;
R1 and R2: fire control input. When the fire control center provides a passive signal, short-circuit the R1 and R2 contacts on the controller to force the switch to switch to the double-divided position and cut off the load.

DCU-HB Controller Block Diagram

Terminal Description:

A +, B-: RS485 communication interface;
D1, D2: switch trip input;
F1, F, F2: generator start and shut-off signals, F is the common point, F1 is the normally open point, F2 is the normally closed point, F, F2 are closed when the main power supply is abnormal;

DCU8-W2、DCU-HB

WHKQ8-100H(G)、WHKQ8-225H(G)

DCU8-W3、DCU-HA

WHKQ8-630H(G)、WHK-TN(/G)2

DCU9-W2、DCU-HA

WHK-TN(/G)3

DCU9-W2

WHKQ3

DCU-A、DCU-B、DCU-HA

WHKN-125N