Typical NEMA LS1 Data
Type 1 Unit; Type 2 Unit;
Line - Neutral Line - Neutral
120/208V & 120/240V 120/208V & 120/240V
Clamping Voltage (Vpk) Clamping Voltage (Vpk)
Category A Ringwave 176 284
(6 kV / 0.2 kA)
Category B Ringwave 288 304
(6 kV / 0.5 kA)
UL 1449 Combination Wave 256 300
(6 kV / 0.5 kA)
Category B Combination 304 336
Wave (6 kV / 3.0 kA)
Category C Combination 440 408
Wave (20 kV / 10.0 kA)
While every precaution has been taken to ensure accuracy and
completeness in this literature, Liebert Corporation assumes no
responsibility, and disclaims all liability for damages resulting
from use of this information or for any errors or omissions.
© 2007 Liebert Corporation. All rights reserved throughout
the world. Specifications subject to change without notice.
All names referred to are trademarks or registered trademarks
of their respective owners.
® Liebert and the Liebert logo are registered trademarks
of the Liebert Corporation.
SL-22090 (R05/07) Printed in USA
Business-Critical Continuity™, Emerson Network
Power and the Emerson Network Power logo are
trademarks and service marks of Emerson
Electric Co. ©2007 Emerson Electric Co.
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Surge Protection
Liebert Corporation
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P.O. Box 29186
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800 877 9222 Phone (U.S. &
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614 888 0246 Phone (Outside U.S.)
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39 049 9719 111 Phone
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852 25722201 Phone
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Technical Support
800 288 6169 Toll-Free
607 724 2484 Phone
607 722 8713 Fax
MOV/SAD Current Sharing – Type 1 Model
The Liebert Answer:
The Liebert TYPE SS Type I Model
offers a true, coordinated multi-stage
system of suppression. It integrates
the fast response time of the silicon
avalanche diode (SAD) with the high-
energy capability of the metal oxide
varistor (MOV) for increased reliability
and performance. This unique circuitry
does not sacrifice the sensitive SAD
module when subjected to a
damaging high-energy transient event.
100.0
90.0
80.0
70.0
60.0
50.0
40.0
30.0
20.0
10.0
0.0
0 5000 10000 15000 20000 25000 30000
8/20 µs Surge Current (Amperes)
Surge Current (%)
SAD Module
MOV Module
Technical Specifications
Voltage Configurations 120/240V and 120/208V
(Please consult factory for additional voltage configurations)
Maximum Continuous ≥125%
Operating Voltage (MCOV)
Fault Current Rating (AIC) 200 kAIC
Operating Frequency Range 47 – 63 Hz
Connection Parallel (4-6 AWG recommended and 14-1/0 AWG capable); wire lug or disconnect
Modes of Protection Line to Neutral/standard
Surge Current Capacity 160 kA per mode
Response Time <0.5 nanoseconds
Dimensions 15.32 in. x 13.32 in. x 6.60 in.
Weight 35 lbs.
Operating Temperature -40°C to +60°C
Status Indication LEDs, Form “C” contacts — 2 sets
Form “C” Contact Rating 120 VAC, 5.0 amps, pF of 1.0
Certifications Product performance and safety standards — UL 1283, UL 1449 Second Edition 2005,
(effective Feb. 9, 2007), C22.2 No.8 Bulletin 516, NEMA LS1-1992
Technology Type 1 Hybrid TVSS — 20 kA of SAD protection and 160 kA of MOV protection
Type 2 MOV only TVSS — 160 kA of MOV protection
Enclosure NEMA 4X; suitable for indoor or outdoor applications
Warranty Covered 24x7 by Emerson Network Power Service Business 10-Years Parts and 5-Years
On-Site Labor