HG Series
Mercury Displacement Relay
WMDR-XUMN-1097
June 1997
Supersedes: WMDR-XUMN Rev A00
Made in the U.S.A.
Printed on Recycled Paper 10% Postconsumer Waste
Power Controls
Watlow Controls, 1241 Bundy Blvd., P.O. Box 5580, Winona, MN, USA 55987-5580, Phone: (507) 454-5300, Fax: (507) 452-4507
Registered Company
Winona, Minnesota USA
ISO 9001
User’s Manual
3.25
(83)
2.16
(55)
.25
Typ.
(6)
Up
3.14
(80)
Mounting
Slot
For #8 To
#10 Screw
3.75
(95)
#10-32
Binding
Head
Screw
Up To #10
A.W.G.
3.43
(87)
Dimensions
1.19
(30)
"A"
1.63
(41)
.20 (5)
Dia. Mtg.
Hole
2.25
(57)
1.94
(49)
Pressure
Connector
2.00
(51)
1 Pole
.21 (5)
Dia. Mtg.
Hole For
#10 Screw
.21 (5)
Wide Slot
For #10
Screw
Hole
3.13
(79)
2.65
(67)
1.94
(49)
40°
Typ.
4.00
(102)
2.62
(67)
"A"
Pressure
Connector
2 Pole
3.13
(79)
4.00
(102)
2.65
(67)
.21
(5)
Dia. Mtg.
Hole For
#10
Screw
.21 (5)
Wide Slot
For #10
Screw
Hole
40°
TYP.
3.75
(95)
"A"
Pressure
Connector
1.94
(49)
3 Pole
ÓÓ
WARNING: Mercury displacement relay must be
mounted vertically. Failure to do this will prevent the
contacts from turning off, which will supply full
voltage to the load. Failure to follow this guideline
could result in damage to equipment, and personal
injury or death.
ÓÓ
WARNING: Mercury displacement relay contacts
will switch ac current only. Not for use with dc
current. Failure to follow this guideline could result
in damage to equipment, and personal injury or
death.
2 Watlow Series HG Mercury Displacement Relay User’s Manual
.21 (5)
Dia.
Mounting
Hole
1.19
(30)
2.25
(57)
#8-32
Binding
Head
Screw
#10-#14
A.W.G.
1.63
(41)
3.58
(91)
2.00
(51)
Dia.
1.94
(49)
.21 (5)
Dia.
Mounting
Hole
3.13
(79)
4.00
(102)
#8-32 Binding
Head Screw
#10-#14 A.W.G.
2.62
(67)
2.65
(67)
1.94
(49)
.21 (5)
Wide Slot
For #10
Screw
Hole
40°
Typ.
4.00
(102)
2 Pole
.21 (5)
Dia.
Mounting
Hole
3.13
(79)
3.75
(95)
4.00
(102)
#8-32
Binding
Head Screw
#10-#14
A.W.G
4.00
(102)
1.94
(49)
.21 (5)
Wide
Slot
For#10
Screw
Hole
40°
Typ.
2.65
(67)
3 Pole
30 Amp Models
HG30-XKDX-0000
Definite Purpose Relay Foot Print
HG30-XAAX-0000
1 Pole
NOTE:
Watlow recommends that ring terminal lugs be used
with stranded wire
on all binding head
screw terminals.
All 35, 50, and 60 Amp Models
“A” Pressure
Dimensions Connectors
HG35-XLDX-0000 4.62 (117) #4-14 A.W.G.
HG50-XMDX-0000 4.62 (117) #4-14 A.W.G.
HG60-XPDX-0000 5.12 (130) #1 - 8 A.W.G.
2.62
(67)
Pressure
Connector
"A"
2.18
(55)
1.88
(48)
(5)
.20 Dia.
Mtg Hole
2.13
(54)
2.50
(64)
1 Pole
(7)
.27 Dia.
Mtg. Hole
5.70
(145)
4.70
(119)
2.79
(71)
.27
(7)
Wide Mtg.
Slot
40°
Typ.
3.25
(83)
3.78
(96)
"A"
Pressure
Connector
2 Pole
(7)
.27 Dia.
Mtg. Hole
(7)
.27 Dia.
Mtg. Slot
40°
Typ.
5.70
(145)
2.79
(71)
4.70
(119)
5.00
(127)
Pressure
Connector
"A"
3.78
(96)
3 Pole
All 80, 100, and 150 Amp Models
Dimensions
Watlow Series HG Mercury Displacement Relay User’s Manual 3
1 Pole Wiring Example
2 Pole Wiring Example
3 Pole Wiring Example
Wiring
120V~(ac)
Fuse
Fuse
1 Pole
120V~(ac)
Coil
Control
Heater
L2
Neutral
L1
Control
Fuse
Fuse
Fuse
Heater
2 Pole
240V~(ac)
Single
Phase
L1
L2
240V~(ac)
Single
Phase
}
Fuse
Fuses
Fuse
3 Pole
120V~(ac)
Coil
Control
N
3-Phase
Wye Heater
208V~ (ac)
3 Phase
Wye
L1
L2
L3
{
“A” Pressure
Dimensions Connectors:
HG80-XABX-0000 5.77 (147) #1-8 A.W.G.
HG1M-XACX-0000 5.77 (147) #1-8 A.W.G.
HG2M-XADX-0000 6.40 (163) #1/0 - #2 A.W.G.
∑∑
WARNING: Wiring must conform to
National Electric Code (NEC) safety
standards, as well as locally applicable
codes. Failure to do so could result in
personal injury or death. See page 6 for
fusing recommendations.
çç
Use copper conductors only.
Temperature Control Output to MDR Coil Input
Please refer to the Field Coil Power Requirements when selecting the correct temperature control output.
Example: An HG35-1LD3-X000 requires 224mA to energize the coil and could be used with Watlow
temperature control output options ‘B’ or ‘K’ (i.e. 988A-XXBB-XXXX or 988A-XXKK-XXXX) models. The
best selection is the ‘B’ output option because it includes an RC snubber across the output. If you select
the ‘K’ option, it is recommended that you also purchase a Quencharc® snubber separately (Watlow part
number 0804-0147-0000). Place the snubber across the MDR coil terminals to protect the temperature
control solid state output. When placing the snubber across the coil of a 2 and 3 pole relay, you may have
to add some lead wire to the snubber. The MDR coil is an inductive load and the snubber will reduce the
flyback voltage produced by the MDR coil when it de-energizes. See below.
Note: Watlow temperature control solid state outputs will not drive VDC coils directly. Refer to the coil
current specifications above and any temperature control output specifications as required by the
application.
Quencharc
Snubber
(Purchase
Separately)
HG30-XAAX-0000
1 Pole 2 Pole 3 Pole
Voltage Current Power Current Power Current Power
24V~ (ac) NA NA 0.456A 10.9VA 0.510A 12.2VA
120V~ (ac) NA NA 0.121A 14.5VA 0.106A 12.7VA
208V~ (ac) NA NA 0.055A 11.4VA 0.055A 11.4VA
240V~ (ac) NA NA 0.063A 15.1VA 0.062A 14.9VA
24VÎ (dc) NA NA 0.240A 5.8W 0.250A 6.0W
HG30-XKDX-0000
HG35-XLDX-0000
HG50-XMDX-0000
HG60-XPDX-0000
1 Pole 2 Pole 3 Pole
Voltage Current Power Current Power Current Power
24V~ (ac) 0.235A 5.6VA 0.529A 12.7VA 1.270A 30.5VA
120V~ (ac) 0.057A 6.8VA 0.133A 16.0VA 0.224A 26.9VA
208V~ (ac) 0.030A 6.2VA 0.075A 15.6VA 0.111A 23.1VA
240V~ (ac) 0.035A 8.4VA 0.087A 20.9VA 0.128A 30.7VA
24VÎ (dc) 0.146A 3.5W 0.266A 6.4W 0.470A 11.3W
HG80-XABX-0000
HG1M-XACX-0000
HG2M-XADX-0000
1 Pole 2 Pole 3 Pole
Voltage Current Power Current Power Current Power
24V~ (ac) 0.930A 22.3VA 2.310A 55.4VA 5.060A 121.4VA
120V~ (ac) 0.195A 23.4VA 0.448A 53.8VA 0.968A 116.2VA
208V~ (ac) 0.097A 20.2VA 0.280A 58.2VA 0.482A 100.3VA
240V~ (ac) 0.112A 26.9VA 0.323A 77.5VA 0.563A 135.1VA
24VÎ (dc) 0.219A 5.2W 0.572A 13.7W 0.555A 13.3W
Field Coil Power Requirements
Watlow Series HG Mercury Displacement Relay User’s Manual 4
HG _ _ - _ _ _ _ - 0 0 _ _
Amperage
30 = 30 Amp
35 = 35 Amp
50 = 50 Amp
60 = 60 Amp
80 = 80 Amp
1M = 100 Amp
2M = 150 Amp
Coil Voltage
1 = 120V~ (ac)
4 = 24V~ (ac)
6 = 24VÎ (dc)
9 = 208/240V~ (ac)
Option
KD = 30 Amp (Standard)
LD = 35 Amp
MD = 50 Amp
PD = 60 Amp
AA = 30 Amp (Definite Purpose
Relay Footprint)
AB = 80 Amp
AC = 100 Amp
AD = 150 Amp
Poles
1 = 1 Pole (Not For Option “AA”)
2 = 2 Pole
3 = 3 Pole
Type
00 = Standard
(Includes Definite Purpose Relay Footprint)
XX = Custom
Ordering Information WMDR-XMNN-1099
1. Call Customer Service: 507-454-5300, or
fax: 507-452-4507, for a Return Material
Authorization (RMA) number before returning any
item for repair.
2. Make sure the RMA number is on the outside of the
carton, and on all paperwork returned. Ship on a
freight prepaid basis.
3. A restocking charge of 20% of the net price applies
for all returned stock controls and accessories in like
new condition and within 120 days after shipment.
Non-stock and modified stock items are not
returnable.
4. If the unit is unrepairable, it will be returned to you
with a letter of explanation. Repair costs will not
exceed 50% of the original cost.
Recycle
To provide proper disposal, Watlow accepts used MDRs.
Phone (507) 454-5300 for an Return Materials
Authorization (RMA) number. Contact your Watlow
representative for details.
The Mercury Relay is warranted to be free of defects in
material and workmanship for 18 months after delivery to
the first purchaser for use, providing that the units have
not been misapplied. Since Watlow has no control over
their use, and sometimes misuse, we cannot guarantee
against failure. Watlow’s obligations hereunder, at
Watlow’s option, are limited to replacement, repair or
refund of purchase price, and parts which upon
examination prove to be defective within the warranty
period specified. This warranty does not apply to
damage resulting from transportation, alteration, misuse,
abuse or improper fusing.
Returns
Warranty
5
Watlow Series HG Mercury Displacement Relay User’s Manual
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 4mΩ 4mΩ 4mΩ 4mΩ 4mΩ 4mΩ 4mΩ 4mΩ
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
ÅÅ
(ac); CSA certified to 600VÅÅ(ac)
*** UL listed to 480V
ÅÅ
(ac)
**** UL listed and CSA certified to 600V
ÅÅ
(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
Loading...