Application:
SNR-Q3M series automatic transfer switch is used for the two-circuit power system of AC 50Hz and rated voltage up
to and including 690V.
It is able to actuate the automatic transfer between the normal power and reserve power, requiring no manual operation.
This switch conforms to the clauses stipulated in the GB/T14048.11 Automatic transfer switching equipment.
Its operating mechanism has reliable electric and mechanical interlock to prevent the normal power and reserve power being switched
on at the same time.
Within the scheduled time after the voltage of normal power detected phase A and each phase is disconnected
the switch can make the load connect to the reserve power from the normal power, after the normal power is recovered
the load returns to the normal power state, while, the switch has the phase-failure protection function.
Specification:
The letters N, R, QN and QR respectively indicate the normal power, reserve power, normal power actuating breaker and reserve
power actuating breaker. Two breakers have the mechanical and interlock dual protections. The controller is made up of voltage
discrimination, phasefailure protection, and control four parts.
When the normal power is normal, and, the switch works in the automatic position, whether QR is in the “closing” or “opening” state
it always finishes the QR-off QNon program first, therefore it can guarantee the load is connected to the normal power.
When the normal power has the trouble like the voltage loss, under voltage or phase failure, after the specified time
the load will be transferred to the reserve power.
The controlling circuit breaker of switch may be the 3-pole or 4-pole molded-case circuit breaker
it can realize the automatic and manual operation, meanwhile, it can actuate the dual power supplies
of automatic and forcible load transfer. According to the customer requirement, normal power indicator
reserve power indicator, normal power tripping indicator and reserve power tripping indicator may be connected
from the external terminal to the control panel.The diagram of this series of automatic transfer switch is very simple
requiring no the secondary connection diagram.so, it is very easy for the engineering design.
The external connection diagram is shown as following description (the indicator uses ADL AC220V).
Diamension:


Package and Pictures:

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