Solid State Relay
Mounting and Installation
Instructions
PROCEDURE:
1. Surface must be flat and clean.
2. Use thermal pad or a thin coat
of Dow DC-340 thermal joint
compound between the relay
and heatsink.
3. Mount to heatsink or suitable
aluminum or copper plate.
4. Use Belleville (spring) washers
and tighten alternately until
spring is slightly deflected.
(approximately 6 inch pounds).
5. Heatsink should be mounted so
that fins are vertical.
6. Ambient temperature not to
exceed 122°F / 50°C when
mounted to suitable heatsink.
7. Do not mount SSR's on panels
that are painted, plastic, steel,
or stainless steel. These materials will not remove the heat
generated by the SSR.
8. Torque 6-32 screws for signal
wires to 10 in-lbs.
9.Torque screws for power connections to 20 in-lbs.
See the reverse side for typical
SSR wiring diagrams.
Screw #8-32
99-1017
Washer
Belleville #8
99-3047
Solid State
Relay
Thermal Pad
0830-0574-0000
Typical
Heatsink
low
F
r
Ai
1241 Bundy Blvd., P.O. Box 5580, Winona, MN 55987-5580
Phone: 507-454-5300, Fax: 507-452-4507 www.watlow.com
0600-0028-0007 Rev D (2393)
January 2011
Made in the U.S.A.
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DC or AC Input Solid State Relay Wiring Diagram
Heater
L2
1
WARNING:
L1
Semiconductor
Fuse
Limit Control
Contacts
(If Required)
2
ç
3-32VDC
DC Input
OR
1
ç
1
2
4
3
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.
(-)
(+)
90-240VAC
AC Input
ç
DC Input, DC Output Solid State Relay Wiring Diagram
Fuse
External
DC Power
Supply
0-100 VDC
1
ç
WARNING:
Heater
Limit Control
Contacts
(If Required)
Install diode if
load is inductive
1(–) (+)2
SSR-100-20A-DC1
Open Collector
DC Input, 3-32VDC
2
4(–) (+)3
(-)
Wiring examples
show L2 in
240VAC or
480VAC configuration. In 120VAC
applications, L2 is
neutral and must
not be fused or
switched. Failure
to follow this
guideline could
result in personal
injury or death.
(+)
3 Phase, 2 leg Solid State Relay Wiring Diagram
L3
L2
L1
2
ç
Semiconductor
Fuses
Limit Control
Contacts
(If Required)
1
ç
3 Phase
Heater
1
2
1
2
4
3
4
3
Control Input Signal
SSR Mounting and Installation Instructions