Installation, Operation, & Maintenance Instructions
IOM JS500.03
2016.04
Vertical Float Switches
VA
Volts
Amps
Watts
Volts
Res.
Amps
Ind.
Amps
X4 & X8
250
Amb.
2000
440
10
50
250
10
0.5
D4 & D8
400
Amb.
2000
440
5
50
250
5
0.5
H4 & H8
250
-100
2000
440
5
50
250
5
0.5
P4 & P8
400
Amb.
6
250
0.25
3.6
250
0.25
0.1
E4 & E8
455
Amb.
2000
440
5
50
250
5
0.5
AC Max. Values
DC Max. Values
Temp
Wetside
(°C)
Low
Temp
Use (°C)
Type
Power Factor 0.4mm
Time Constant 40ms Max.
Electrical characteristics
4 Contact Type : D4, X4, P4, H4
2X independent SPST
AA make on rise : BB make on fall
8 Contact Type : D8, X8, P8, H8
Double pole double throw
(4X independent SPST)
AA make on rise : BB make on fall
Note:
For DPDT operation, installer must
common any one pair of A and B wires in
the terminal block for each of the two ends
of the switch mechanism.
Wiring Examples
Single Switch
As high level alarm
As low level alarm
Pump Control Switch
LLA Switch
A
A
B
B
A
A
B
B
Alarm ON
Alarm ON
Dual Switch: Combined Pump Control
And Low Level Alarm
A
A
B
B
A
A
B
B
Pump ON
Alarm ON
Dual Switch: High and Low Level Alarm
A
A
B
B
A
A
B
B
HLA Switch
LLA Switch
Each switch mechanism has flying leads which are factory wired to
ceramic terminal blocks fixed in the switch enclosure.
Electrical rating
Warning
Gold plating on the contacts of the P4 and P8 switch mechanisms may be
permanently damaged if the mechanisms are used to switch circuits with
values greater than those shown above.
Important wiring notes
1. To minimize electrical shock hazard,
before energizing,
it is essential
that the equipment is connected to a protective ground using the terminals
supplied.
2. Switches must not be used for the direct starting of motors. Contacts
should be wired in series with the operating coils of relays, contactor
starters or solenoid valves, and fused separately.
3. The temperature of the switch enclosure may at times approach the
temperature of the process and suitable heat resisting cables should
therefore be used, together with appropriate cable glands.
4. A sufficient length of flexible cable should be fitted to allow easy removal
of the switch head and float assembly at any time.
Explosion-proof models
5. Cable entry shall be fitted with an explosion-proof cable entry device, with
or without thread adaptor, and should be used in accordance with all local
and national codes.
6. FM Approved Applications: Copper conductors 60
⁰
/75
⁰
C: 140
⁰
/167
⁰
F
ONLY. Torque terminals to 7in.-lbs (6cm-kg).
7.
Ensure the cover locking safety grub screw is replaced and
tightened before energizing.
Two switch pump control circuit using
auxiliary contacts on starter. Note diagram
shows starter fitted with 250V coil for 3-phase
3-wire supply connect coil terminal N to line 1
and fit 440V coil.
Two switch pump control circuit using
‘holding’ relay for starters without
auxiliary contacts.
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