SOLID CORE AND SPLIT CORE ADJUSTABLE CURRENT “STATUS” SWITCHES
5
63-2651—1
WARNING
The secondary of the 5 amps current transformer
must be shorted together before the power may be
turned on to the monitored device.
For applications in which the normal operating current is
greater than 250 Amps or for conductor diameters larger that
3/4 in. (19 mm) in diameter, and external 5 Amps Current
Transformer (C.T.) must be used as shown in Fig. 6.
Fig. 6. Current transformer
Latch Operation
Pressing down on the two (2) side tabs and swinging the cover
open opens the split core current switch as shown in Fig. 7.
Lifting up the latch with a flat-tip screwdriver as shown in Fig. 8
can also open the unit. Press down firmly on the cover to close
the current switch. An audible “
click
” will be heard as the tab
slides over the tongue on the base.
CAUTION
Mating surfaces of the magnetic core are exposed
when the sensor is open. Silicone grease, present
on the cores to prevent rust, can capture grit and
dirt if care is not exercised. Operation can be
impaired if anything prevents good contact
between pole pieces. Visually check the mating
parts of the core before closing the current sensor.
Fig. 7. Opening sensor by hand
Fig. 8. Opening with a screwdriver
Wiring
Honeywell recommends the use of a 2 conductor 16 to
22 AWG (1.3 to 0.3 mm
2
) shielded cable or twisted wire,
copper wire only, for all current switch output applications. A
maximum wire length of less than 98.4 feet (30 meters) should
be used between the current switches and the Building
Management System or controller.
NOTE: When using a shielded cable, be sure to connect only
(1) end of the shield to ground at the controller. Con-
necting both ends of the shield to the ground may
cause a ground loop.
When removing the shield from the sensor end, make sure to
properly trim the shield so as to prevent any chance of
shorting. The current switch output terminals represent a solid-
state switch for controlling AC and DC loads and is not polarity
sensitive. The recommended torque to be used on the terminal
block connections is 5.93 in-lbs. (0.67 Nm). The aperture (hole)
size of the current switch is 3/4 in. (19 mm) and will accept a
EXAMPLE: FOR CURRENTS UP TO 600 AMPS, USE A 600:5 RATIO C.T.
AS
SHOWN.
INSULATED
CONDUCTOR
600:5 RATIO 5A C.T.
WIRE NUT
M25295A
C
U
R
L
US
C
US
R
U
L
M25298
M25299
C
US
R
U
L
