contactors

CONTACTORS TYPE TDN
CHANGE-OVER CONTACTORS TDN FROM 46 TO 4000 AMPS, 1000V A.C.&D.C.

A standard contactor can be fitted with normally open poles (poles open when the contactors is deenergized) and also with normally closed poles assembled on the same axle.

The extreme operational conditions which can be obtained with a continuous adjustability, are the following:

a) when closing the contactor, the N/C pole <<R>> opens before the closing of the normal pole <<N>> and, viceversa, when opening, <<N>> opens before <<R>> closes (type of adjustment suitable for the change-over contactors);
b) when closing the contactor, the pole <<R>> opens after closing of the pole <<N>> and, viceversa when opening, <<R>> closes before <<N>> opens (type of adjustment suitable for the field discharge contactors).

As already mantioned, the main characteristic is the possibility of passing from one to the other of the two extreme setting conditions with no-step, even adjusting within large limits the change-over time, or the delay of one pole in respect of the other.
The poles type <<R>> are produced in standard sizes with rating up to 1000 Amps; for higher ratings poles of the existing sizes have to be connected in parallel.
It is also remarkable that the poles <<R>>, besides with poles <<N>> of the same size, can be combined with poles of different sizes as indicated in the table below. Of course the same combinations can also be made with only poles <<R>> or only poles <<N>> of different sizes.
The poles type <<R>> have the same overall dimensions of the poles <<N>> but for the height.
Therefore the overall dimensions of the change-over contactors correspond exactly to those of the normal contactors of the same size and number of poles, except for those indicated in the table below.

Overall Dimensions of N.C. pole (Table N°12)

TYPE	Figured Dimensions [mm]
TYPE	C	D	I	N	O	P	Q	R	S	T	U
R 85	90	105	120	42	-	-	M6	-	20	48	6,5
R 125	90	115	130	42	-	-	M6	-	20	48	8,5
R 190	90	135	150	42	-	-	M8	-	20	48	8,5
R 270	140	170	195	50	-	-	M8	-	25	57	8,5
R 350	140	180	200	50	-	-	M8	-	25	57	8,5
R 550	140	195	230	52	-	-	M12	-	40	70	13
R 650	150	200	230	52	-	-	M12	-	40	70	13
R 800	80	295	350	173	110	18	M10	25	50	63	10,5
R 1000	80	295	350	173	110	18	M10	25	50	63	10,5
R 1250	80	295	350	173	110	18	M10	25	50	63	10,5

Electrical characteristics of the normally closed poles
(table N°13)

POLE TYPE R	Rated thermal current	Breaking capacity A.C. (R.M.S. value, cos =0,5) [A]			Breaking capacity D.C. (Time constant L/R = 15 ms) [A]				Making capacity	Possible combination with poles N type
POLE TYPE R	[A]	220V	380V	550V	110V	220V	440V	600V	[A]	Possible combination with poles N type
R 85	85	1600	1300	1000	1600	1000	500	400	2500	85-125-190
R 125	125	2000	1600	1250	2000	1250	700	500	3000
R 190	190	2500	2000	1900	2500	1900	900	700	4000
R 270	270	4500	3500	2700	4500	2700	1300	1000	6000	270-350-550-6503
R 350	350	5000	4000	3500	5000	3500	1700	1200	7000
R 550	550	6000	5000	4000	6000	4000	2000	1500	8000
R 650	650	8000	6500	5000	8000	5000	2500	2000	10000
R 800	800	10000	8000	7000	10000	7000	4000	3000	15000	800-3000
R 1000	1000	12000	10000	8000	12000	8000	5000	3500	15000
R 1250	1250	12000	10000	8000	12000	8000	5000	3500	20000

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