Omega SSRL240, SSRL660 User guide

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User’s Guide

SSRL240/SSRL660 SERIES

Solid State Relays

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The information contained in this document is believed to be correct, but OMEGA Engineering, Inc. accepts
no liability for any errors it contains, and reserves the right to alter specifications without notice.
WARNING: These products are not designed for use in, and should not be used for, patient-connected applications.

PRECAUTIONS

A number of essential safety precautions must be observed in the installation
and use of a Solid State Relay (SSR).

The SSRs should be installed and serviced by qualified technicians familiar
with high voltage and current circuits. Note that an SSR has a small leakage
current when the contacts are “open”. Normal failure condition is contacts
“closed”. A special Fast Blowing I2T fuse and a mechanical interrupt switch are
recommended in the load circuit. In certain applications a mechanical interrupt
switch should be installed in the control circuit.

GENERAL DESCRIPTION

The Omega

®

Solid State Relays (SSR’s) are a series of single-pole, normally
open, solid state switching devices with no moving parts, capable of tens of
millions of cycles of operation. It is designed to control 120V, 240V or 480V (up
to 660V) alternating current (VAC), and provides zero voltage switching and
2500VAC isolation between the load terminals and the control signal. A control
signal (AC or DC input, depending on unit selected) causes the SSR to switch
the ac load ON or OFF just as a conventional mechanical contact switch does
but with none of the problems associated with moving contact relays, such as
corrosion, pitting, arcing, radio frequency interference (RFI) and bounce. The
result: much longer life for the SSR.

The SSR is designed around a pair of SCR’s mounted on a heat-spreading
metal base to eliminate thermal fatigue failures. To dissipate the heat
developed naturally in an SSR due to a nominal voltage drop across the
device, the SSR must be mounted on a Finned Heat Sink (FHS), or on a metal
plate of adequate size (see Section 4). It is advisable to install an SSR where
the ambient temperature is relatively low because its current-switching rating is
decreased as its temperature increases.

Control resistance heaters up to 40 kW use solid state relays in conjunction
with lower-rated temperature controllers. Three-phase loads can be controlled
using 2 or 3 SSR’s. Use 3 SSR’s for Y-phase loads using a neutral line. Three
solid state relays are also used when there is no neutral load to provide
redundancy and extra assurance of control. Two SSRs will control “delta” loads
with no neutral line.

1

FINNED HEAT SINKS (FHS)

The Finned Heat Sinks (FHS) are anodized, aluminum fabrications which come
complete with tapped mounting holes, and screws to mount the SSR.

FHS-1 and FHS-2 Heat Sink

FHS-1 - FHS-2 Heat Sink

FHS-6 Heat Sink (0.7°C/W Thermal Rating)

FHS-6 Heat Sink

2

2.000"

0.200"

0.062

DIMENSIONS IN INCHES

2.000"

0.167"

4.416"

0.250"

C

FHS-1

FHS-2 5.50"

SSR MOUNTING HOLES (2) 8-32 THDS.

2.62

A

B

8-32 TH'D

2 Places

1.875"

3.00" 2.50"

5.00" 1.81"

5.50

4.50

0.125" R

THERMAL
RATINGCBA

0.56" 2°C/W

1.2°C/W

0.50

4.750"

4.56

CENTERS

#6

SCREWS

1.811.87

1.44

END VIEW

0.20

C

L

TOP VIEW

C

L

4.75

0.218

(TYP.)

(TYP.)

FUSE PROTECTION

The load side of the SSR should be protected by a Fast-Blowing I2T fuse.
Recommended fuses and part numbers are given in below. Although a
semiconductor relay is designed for virtually countless operation cycles, it can
be destroyed by an over-voltage or a short circuit, unless protected adequately
by the fast fuse.

Table 3-1 shows the part numbers of the fuses and fuse blocks that can be
used with each of the SSRs. Lower rated fast-blow fuses should be used if the
current being controlled is below the rated capacity of the SSR. Bussman or
equivalent fuses should be used. It is essential that a proper fast-blow (I2T)
fuse is used. SSR’s normal failure mode on overloaded circuits is closed
contacts (ON-STATE).

LEAKAGE CURRENT

In the OFF state, all SSRs have a small leakage current through their contacts,
typically .1mA for 240V versions and .25mA for 660V versions. As a result, a
voltage potential will always exist on the LOAD SIDE, even when the “contacts”
are “open”. The voltage level is a function of the load resistance. In accordance
with E = IR, the voltage level equals leakage current times load resistance.

The voltage level will rise to FULL LINE VOLTAGE under NO LOAD (open
circuit) or high resistance conditions. Under normal operating conditions,
however, it is very small. A 120-Watt (W) load has a resistance of 1 ohm. With
“open contacts”, a leakage current of 15mA will cause 15mV across the load (E
= 15 mA × 1 ohm). A mechanical switch is recommended between the AC
power source and the SSR to provide electric isolation for servicing the load.

SSR Part Maximum Fuse Part Fuse Block
Number Current Capacity Number Part Number

SSRL240AC10 10 Amps ac KAX-10 FB-1, FB-2, FB-3
SSRL240AC25 25 Amps ac KAX-25 FB-1, FB-2, FB-3
SSRL240AC50 50 Amps ac KAX-50 BS101
SSRL240AC75 75 Amps ac KAX-70 BS101
SSRL240AC100 100 Amps ac KAX-100 BS101

SSRL240DC10 10 Amps ac KAX-10 FB-1, FB-2, FB-3
SSRL240DC25 25 Amps ac KAX-25 FB-1, FB-2, FB-3
SSRL240DC50 50 Amps ac KAX-50 BS101
SSRL240DC75 75 Amps ac KAX-70 BS101
SSRL240DC100 100 Amps ac KAX-100 BS101

SSRL660AC50 50 Amps ac KAX-50 BS101
SSRL660AC75 75 Amps ac KAX-70 BS101
SSRL660AC100 100 Amps ac KAX-100 BS101

SSRL660DC50 50 Amps ac KAX-50 BS101
SSRL660DC75 75 Amps ac KAX-70 BS101
SSRL660DC100 100 Amps ac KAX-100 BS101

3

Output-ac Load

Max. Off-State Leakage

Nominal ac Line Nominal Load Max. Contact (25°C max. ambient) Max Forward

Model No. Voltage Current Voltage Drop 120Vac 240Vac 660Vac Voltage Drop

SSRL240AC10 10 A 0.1 mA 0.1 mA 1.35

SSRL240AC25 25 A 0.1 mA 0.1 mA 1.35

SSRL240AC50 24 to 280Vac 50 A 1.6V 0.1 mA 0.1 mA N/A 1.35

SSRL240AC75 75 A 0.1 mA 0.1 mA 1.3

SSRL240AC100 100 A 0.1 mA 0.1 mA 1.3

SSRL240DC10 10 A 0.1 mA 0.1 mA 1.35

SSRL240DC25 25 A 0.1 mA 0.1 mA 1.35

SSRL240DC50 24 to 280Vac 50 A 1.6V 0.1 mA 0.1 mA N/A 1.35

SSRL240DC75 75 A 0.1 mA 0.1 mA 1.3

SSRL240DC100 100 A 0.1 mA 0.1 mA 1.3

SSRL660AC50 50 A 0.25 mA 0.25 mA 0.25 mA 1.35

SSRL660AC75 48 to 660Vac 75 A 1.6V 0.25 mA 0.25 mA 0.25 mA 1.3

SSRL660AC100 100 A 0.25 mA 0.25 mA 0.25 mA 1.3

SSRL660DC50 50 A 0.25 mA 0.25 mA 0.25 mA 1.35

SSRL660DC75 48 to 660Vac 75 A 1.6V 0.25 mA 0.25 mA 0.25 mA 1.3

SSRL660DC100 100 A 0.25 mA 0.25 mA 0.25 mA 1.3

ELECTRICAL SPECIFICATIONS

4

Input-Control Signal

Control Signal Control Signal Control Signal Max Input Peak Voltage *

Model No. Type Voltage Turn-On Turn-Off Current (60 sec. max)

SSRL240AC10

SSRL240AC25

SSRL240AC50 AC Control Signal 90 to 280VAC 90VAC 10VAC 10mA 800V

SSRL240AC75

SSRL240AC100

SSRL240DC10

SSRL240DC25

SSRL240DC50 DC Control Signal 3 to 32VDC 3VDC 1VDC 14mA 800V

SSRL240DC75

SSRL240DC90

SSRL660AC50

SSRL660AC75 AC Control Signal 90 to 280VAC 90VAC 10VAC 10mA 1200V

SSRL660AC100

SSRL660DC50

SSRL660DC75 DC Control Signal 4 to 32VDC 4VDC 1VDC 14mA 1200V

SSRL660DC100

ELECTRICAL SPECIFICATIONS

*Transients above table value should be suppressed.

5

The following SSRs are available from OMEGA Engineering.

MOUNTING THE SSR

The SSR assembly (including heat sink) can be located close to the load,
minimizing the lengths of power cables. The actuating device, such as a
temperature controller, can then be located in an area more convenient to the
operator.

The FHS on which the SSR is to be mounted has been pre-drilled and tapped,
and is supplied with mounting screws. The SSR is supplied with a thermally
conducting pad (attached). Mount the SSR securely to the heat sink with the
mounting screws.

The best location for the SSR is an open area with unrestricted air movement.
The FHS should be mounted on a vertical surface with the fins vertical. If it is
mounted with the fins horizontal, or on a horizontal surface, the thermal
coefficient must be re-dated by 20%. For air flow, allow at least

1

⁄2 in. clearance

at each end and 1 in. on the sides.

Part Nominal Load
Number Description Current (AC Amps)

SSRL240AC10 AC Control Signal 10
SSRL240AC25 (24 to 240VAC line) 25
SSRL240AC50 50
SSRL240AC75 75
SSRL240AC100 100

SSRL240DC10 DC Control Signal 10
SSRL240DC25 (24 to 240VAC line) 25
SSRL240DC50 50
SSRL240DC75 75
SSRL240DC100 100

SSRL660AC50 AC Control Signal 50
SSRL660AC75 (48 to 660VAC line) 75
SSRL660AC100 100

SSRL660DC50 DC Control Signal 50
SSRL660DC75 (48 to 660VAC line) 75
SSRL660DC100 100

6

7

2.250

Mounting Dimensions Fuse Blocks (in.)

FB-1 3.25L x 0.75W x 1.3H

FB-2 3.5L x 2.0W x 1.18H

FB-1 3.5L x 3.0W x 1.3H

BS101 1.75W x 2.29H

supplied in 2 sections to adjust for length of fuse
max. length with 100A fuse approx. 5 in.

SSR Dimensions (inches)

0.275

1.700

0.470

1.750

1.000

1.100

INPUT

0.450 SQ. 0.480 SQ.

1.850

0.870

0.785

OUTPUT

0.250

SPECIFICATIONS

GENERAL SPECIFICATIONS

(1)

PARAMETER ALL DEVICES

Operating Temperature Range –20° to +80°C
Storage Temperature Range –40° to +80°C
Input to Output Isolation Voltage

(2)

4000 V rms
Input/Output to Ground Isolation Voltage 2500 V rms
Capacitance Input to Output (Max) 8 pF
Line Frequency Range 47 to 63 Hz

INPUT SPECIFICATIONS

(1)

PARAMETER SSRs DC SSRs

Control Voltage 90–280 VAC 3–32 VDC

(4)

Drop Out Voltage 10 Vrms 1.0 VDC
Maximum Input Current

(3)

10 mA rms 14 mADC

Turn-On Time 20 ms 0.5 Cycle Max.

(5)

Turn-Off Time 30 ms 0.5 Cycle Max.
Nominal Input Impedance Current Regulated

OUTPUT SPECIFICATIONS

(1)

PARAMETER SSRs UNITS

Maximum On-State Current

(6)

10 25 50 75 100 Arms
Minimum On-State Current 50 50 100 100 100 mArms
Maximum 1-Cycle Surge

(7)

150 300 750 1000 1200 Apeak

Maximum 1-Second Surge

(8)

30 75 150 225 300 Apeak
On-State Voltage Drop

(9)

1.35 1.35 1.3 1.3 1.3 Vpeak

I2T (60 Hz) 416 937 2458 5000 6000 A2sec

FOOTNOTES

(1) Specifications apply to TA–30 to +80°C unless otherwise noted.
(2) At TAof 25°C for one second, maximum leakage 1 mA.
(3) At maximum input voltage.
(4) 660V versions 4-32VDC
(5) Zero cross over firing.
(6) With relay properly mounted on an adequate heatsink.
(7) At TAof 25°C, non-repetitive.
(8) At TAof 25°C.
(9) At TAof 25°C and maximum on-state current.

8

WARRANTY/DISCLAIMER

OMEGA ENGINEERING, INC. warrants this unit to be free of defects in materials and
workmanship for a period of 13 months from date of purchase. OMEGA’s Warranty
adds an additional one (1) month grace period to the normal one (1) year product
warranty to cover handling and shipping time. This ensures that OMEGA’s
customers receive maximum coverage on each product.

If the unit malfunctions, it must be returned to the factory for evaluation. OMEGA’s
Customer Service Department will issue an Authorized Return (AR) number
immediately upon phone or written request. Upon examination by OMEGA, if the unit
is found to be defective, it will be repaired or replaced at no charge. OMEGA’s
WARRANTY does not apply to defects resulting from any action of the purchaser,
including but not limited to mishandling, improper interfacing, operation outside of
design limits, improper repair, or unauthorized modification. This WARRANTY is VOID
if the unit shows evidence of having been tampered with or shows evidence of having
been damaged as a result of excessive corrosion; or current, heat, moisture or
vibration; improper specification; misapplication; misuse or other operating conditions
outside of OMEGA’s control. Components which wear are not warranted, including but
not limited to contact points, fuses, and triacs.

OMEGA is pleased to offer suggestions on the use of its various products.
However, OMEGA neither assumes responsibility for any omissions or errors nor
assumes liability for any damages that result from the use of its products in
accordance with information provided by OMEGA, either verbal or written.
OMEGA warrants only that the parts manufactured by it will be as specified and
free of defects. OMEGA MAKES NO OTHER WARRANTIES OR
REPRESENTATIONS OF ANY KIND WHATSOEVER, EXPRESS OR IMPLIED,
EXCEPT THAT OF TITLE, AND ALL IMPLIED WARRANTIES INCLUDING ANY
WARRANTY OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
PURPOSE ARE HEREBY DISCLAIMED. LIMITATION OF LIABILITY: The remedies
of purchaser set forth herein are exclusive, and the total liability of OMEGA with
respect to this order, whether based on contract, warranty, negligence,
indemnification, strict liability or otherwise, shall not exceed the purchase price
of the component upon which liability is based. In no event shall OMEGA be
liable for consequential, incidental or special damages.

CONDITIONS: Equipment sold by OMEGA is not intended to be used, nor shall it be
used: (1) as a “Basic Component” under 10 CFR 21 (NRC), used in or with any nuclear
installation or activity; or (2) in medical applications or used on humans. Should any
Product(s) be used in or with any nuclear installation or activity, medical application,
used on humans, or misused in any way, OMEGA assumes no responsibility as set
forth in our basic WARRANTY/ DISCLAIMER language, and, additionally, purchaser will
indemnify OMEGA and hold OMEGA harmless from any liability or damage
whatsoever arising out of the use of the Product(s) in such a manner.

RETURN REQUESTS/INQUIRIES

Direct all warranty and repair requests/inquiries to the OMEGA Customer Service
Department. BEFORE RETURNING ANY PRODUCT(S) TO OMEGA, PURCHASER
MUST OBTAIN AN AUTHORIZED RETURN (AR) NUMBER FROM OMEGA’S
CUSTOMER SERVICE DEPARTMENT (IN ORDER TO AVOID PROCESSING DELAYS).
The assigned AR number should then be marked on the outside of the return package
and on any correspondence.

The purchaser is responsible for shipping charges, freight, insurance and proper
packaging to prevent breakage in transit.

FOR WARRANTY

RETURNS, please have
the following information available
BEFORE contacting OMEGA:

1. Purchase Order number under which

the product was PURCHASED,

2. Model and serial number of the product

under warranty, and

3. Repair instructions and/or specific

problems relative to the product.

FOR NON-WARRANTY REPAIRS,

consult
OMEGA for current repair charges. Have
the following information available
BEFORE contacting OMEGA:

1. Purchase Order number to cover the

COST of the repair,

2. Model and serial number of the product,

and

3. Repair instructions and/or specific

problems relative to the product.

OMEGA’s policy is to make running changes, not model changes, whenever an improvement is possible.
This affords our customers the latest in technology and engineering.

OMEGA is a registered trademark of OMEGA ENGINEERING, INC.
© Copyright 2002 OMEGA ENGINEERING, INC. All rights reserved. This document may not be copied,

photocopied, reproduced, translated, or reduced to any electronic medium or machine-readable form, in
whole or in part, without the prior written consent of OMEGA ENGINEERING, INC.

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