Specifications, Fusing – Watlow Mercury Relay or MDR Retrofit User Manual
Page 13
Model Number
HG30-XKDX HG30-XAAX
HG35-XLDX HG50-XMDX HG60-XPDX
HG80-XABX HG1M-XACX HG2M-XADX
Contact Type
N.O.
N.O.
N.O.
N.O.
N.O.
N.O.
N.O.
N.O.
Maximum Load
See Table
Current ac
30A
30A
35A
50A
60A
80A
100A
Below
(typ) Contact
Resistance
4m
Ω
4m
Ω
4m
Ω
4m
Ω
4m
Ω
4m
Ω
4m
Ω
4m
Ω
Load Wire
10-14AWG 10-14AWG 4-14AWG
4-14AWG
1-8AWG
1-8AWG
1-8AWG
1/0-2AWG
Terminations
bhs
bhs
pc
pc
pc
pc
pc
pc
Coil Wire
#6-32bhs
#6-32bhs
#6-32bhs
#6-32bhs
#6-32bhs
#6-32bhs
#6-32bhs
#6-32bhs
Terminations
up to
up to
up to
up to
up to
up to
up to
up to
#12AWG
#16AWG #12AWG
#12AWG
#12AWG
#12AWG
#12AWG
#12AWG
Load Type
Resistive
Resistive
Resistive
Resistive
Resistive
Resistive
Resistive
Resistive
Maximum Load
Voltage ac
480/600**
480/600**
600****
600****
480/600****
480***
480***
480/600
Load Frequency
50/60 Hz.
50/60 Hz.
50/60 Hz.
50/60 Hz.
50/60 Hz.
50/60 Hz.
50/60 Hz.
50/60 Hz.
Pull-in Time
70 mS
50 mS
70 mS
70 mS
70 mS
90 mS
90 mS
90 mS
Drop-out Time
90 mS
70 mS
90 mS
90 mS
90 mS
140 mS
140 mS
140 mS
Operating
Ambient
-35 to 55°C
-35 to 55°C
-35 to 55°C
-35 to 55°C
-35 to 55°C
-35 to 55°C
-35 to 55°C
-35 to 55°C
Storage
Temperature
-40 to 100°C -40 to 100°C -40 to 100°C -40 to 100°C -40 to 100°C -40 to 100°C -40 to 100°C -40 to 100°C
Hg - Mass/Contact
1.82 oz.
0.84 oz.
1.75 oz.
1.75 oz.
1.75 oz.
8.93 oz
8.93 oz.
9.46 oz.
Weight : 1 Pole
1.0 lbs.
1.0 lbs.
1.0 lbs.
1.0 lbs.
1.0 lbs.
2.0 lbs.
2.0 lbs.
2.5 lbs.
2 Pole
2.0 lbs.
2.0 lbs.
2.0 lbs.
2.0 lbs.
2.0 lbs.
3.5 lbs.
4.0 lbs.
4.5 lbs.
3 Pole
2.5 lbs.
2.0 lbs.
3.0 lbs.
3.0 lbs.
3.0 lbs.
4.5 lbs.
7.0 lbs.
7.0 lbs.
Note:
pc
=
pressure connector
bhs
=
binding head screw
Note:
Watlow recommends that you do not exceed 30
cycles per minute.
Note:
Watlow recommends that ring terminal lugs be
used on all binding head screw terminals.
Note:
When replacing Watlow MD style relays,
consider the HG60 model if larger gauge or
multiple wires are required. See the load
termination specification above.
Specifications
WMDR-XSPN-1098
Note: The 150 Amp relay (HG2M-XADX) is not UL or
CSA approved.
** UL listed to 480V
Е
Е
(ac)
; CSA certified to 600V
Е
Е
(ac)
*** UL listed to 480V
Е
Е
(ac)
**** UL listed and CSA certified to 600V
Е
Е
(ac)
Watlow Series HG Mercury Displacement Relay User’s Manual 6
Volts
120
208
240
277
480
600
Amps
150
140
135
130
120
120
HG2M-XADX Load Current Table
Fusing
To prevent the MDR from rupture in the event of a heater
short circuit, you should always fuse the MDR load circuit.
Watlow recommends a Bussmann type JJN or JJS (Class
T) fuse or equivalent. Select a fuse size 1.25 times the
connected load or the next size above, but do not exceed
1.6 times the MDR rating. To fuse the MDR field coil, you
can use Bussmann fuse number MDL-2 for coils up to
240V~ (ac). For coils up to 480V~ (ac), use Bussmann fuse
number JJS-1.
∑
∑
WARNING:
Install high or low temperature control
protection in systems where an overtemperature or
undertemperature fault condition could present a
fire hazard or other hazard. Failure to install
temperature control protection where a potential
hazard exists could result in damage to equipment
and property, and personal injury or death.
Agency Approvals
•
UL, File #ULE177629
•
CSA File #LR22416