Construction
AZR devices consist of three sub-units:
– Sub-unit protecting from overload currents and short-circuit currents, including two switchdisconnectors with fuses of RBK type.
– Switching sub-unit PSA build of two contactors interlocked electrically and mechanically, situated on the same supporting frame.
– Automatics module MSR-3 including phase sequence and undervoltage sensors, time relays and control protections.
Automatic switching devices of AZR type fulfil requirements of PN-EN 60947-6-1 standard.

Operation
In the chance of AC dump, the disappearance of the phase or when the sum of three phasic tensions crosses the threshold Umax (not regulated) and the tension in one from phases will come down the below disposed threshold Umin. (of calibrated for the weight of the asymmetric tension in one phase) in the line of the basic power supply, tap-dances the switch of receivers on the line of the reserve power supply. The temporary delay can be placed by the user to 15 seconds (the time of the return tp-K4). After the return of the tension in all phases to the disposed value with the potentiometer ,, the asymmetry” on the transmitter K1 of enlarged for the value of the hysteresis in the line of the basic power supply, tap-dances the automatic switch of the system and the return to the start state. The temporary delay placed , is a sum of the return of the transmitter K1 (to 15 seconds) and the time of getting down to work of the transmitter (to 15 seconds).

Application
Automatic switching devices of AZR type are intended for switching the load circuits in case of parameters deviation occurrence, for continuous monitoring of primary supply, and for automatic return switching of the load, when the deviation has passed. Switching occurs with the time delay determined in advance, and switching on takes place in zero-current period. In case, when both supply sources (primary and reserve one) are in good order, AZR system goes into position for supply from the primary source. Switching devices of AZR type which form the system for automatic switching on of the reserve power supply are used in LV networks, ensuring the operation continuity for supplied loads. They operate in the configuration of full automatics, which does not require any supervision by personnel. AZR devices can be applied in various climate conditions and at the sites located up to 2000 above sea level. In case of voltage loss in both supply lines (i.e. primary and reserve supply line), the AZR device switches on automatically this line of supply, which first recovers the supply voltage. Time of the switch over (minimum 1 s) is set by means of adjustable time relays. In order to ensure safe and failure-free operation in the switching module, apart from electrical interlocking for contactors, there is used mechanical interlocking excluding the state, when both contactors are closed in the same time (e.g. in case of contact welding occurrence).

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Set type	Identifcation No	Item No.
AZR 160	K072 4263 T1	606-T04001
AZR 220	K082 4283 T1	606-T03001
AZR 400	K092 4323 T1	606-T02001
AZR 550	K112 4343 T1	606-T01001

Automatic switching device (automatic switching on of the reserve power supply) for continuous current Iu = 220 A.
AZR 220 K082 4283 T1

Note!
At the client’s request (agreed in advance) there is a possibility of manufacturing the AZR automatic switching device equipped with light signaling of its operational state or the automatic switching device for another value of the continuous current..

Type					AZR 160	AZR 220	AZR 400	AZR 550
Class					CC	PC	PC	PC
Rated insulation voltage		main circuits	Ui	[V]	690
		control circuits			250
Rated switching voltage			Ue	[V]	400
Rated control voltage			Us	[V]	230
Rated frequency				[Hz]	50
Rated contionus/switching current		(+40 ºC / AC31A, AC33A, AC35A)	Iu/Ie	[A]	160	220	400	550
Hysteresis	the symmethrical height		Umax	-	1,2 % Un
	the symmethrical decrease		Umin	-	1,2 % Un
	the decrease into 1 to the phase		Umin	-	1,7 % Un
Actuation voltage	setting Umax=115%Un (not rgulated, the symmethrical height into 3 phases)			[V]	460
	setting Umin=-15% ÷ -0% Un (calibrated for the asymmethric decrease in one phase, what answers -30% values of the psychic tension and -10% to the symmethrical decrease)		Uzf	[V]	175
Minimum actuation voltage after emergency disconnection			Upf	[V]	182*)
Adjusted operating time	actuation delay toz=(the time of the return /tp K4/)			[s]	0,5÷15
	the delay of return to the top top=(the time of the return /tp K1/ + the time of getting down to work /tz K4/)		<4/)	[s]	0,65÷30
The highest rating currents of fuse inserts of gG type				[A]	160	250	400	630
Max allowed cross-sections for connecting cond. of multi-wire type with eylet-type terminal				[mm2]	70	95	2 x 120	2 x 185
Size of fuse inserts				-	00	1	2	3
Connection of supply cables				-	from the bottom
Power consumptionŕ		starting		[VA]	<770		<2200
		holding		[VA]	<45		<140
Working temperature				ºC	-15÷+45
Number of positions for main contacts				-	2 (basic and reserve)
Protection degree				-	IP55
Metal enclosure Enclosure is protected against corrosion with powder coating in color RAL 7032 with sizes		width		[mm]	500	550	650	650
		height			1000	1100	1250	1250
		depth			250	250	300	300

*) in the dependence from the disposed asymmetry enlarged for the value of the hysteresis.

The other technical parameters of contractors SA75M, SA110M, SA200, SA250 can be found in the relevant catalogue at pages 5-9.

Fuse inserts are not included in the supply.

Type	A	B	C	D
AZR 160	500	1000	450	1060
AZR 220	550	1100	500	1160
AZR 400	650	1250	600	1310
AZR 550	650	1250	600	1310