Load Interrupter Switch

The UL Load Interrupter Switch (LIS) is designed for three-phase medium-voltage distribution systems from 4.76 kV to 38 kV. Built for use in metal-enclosed switchgears, the LIS provides dependable load switching performance for substations, cubicles, transformer and cable protection, and medium-voltage feeder applications. With a durable frame and arc interruption structure, this switch supports reliable operation in medium-voltage power distribution systems.

Rated Voltage: 4.76 – 38 kV
Rated Current: 200 – 1200 A
Fault Making: Up to 40 kA

Key Features

Switching Performance

Supports load current switching in medium-voltage systems. Arc interruption structure provides stable switching operation.

Design Flexibility

Supports left- or right-hand operation and inverted configurations. Fuse KIT and barriers allow expanded protection configurations.

Operational Convenience

Auxiliary contacts enable remote status monitoring. Motorized operation KIT improves operating convenience.

Safety

Padlock and Kirk Key lock options help prevent incorrect operation. Grounding options and insulating barriers enhance operational safety.

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Lineup

Line-up
Line-up		ULI-06 Mini	ULI-05 / 15	ULI-27 / 29	ULI-38	UGS-05 / 15 / 27 / 38
Voltage		5.5 kV	4.76 / 15 kV	27 / 29 kV	38 kV	4.76 / 15 / 27 / 38 kV
Current		200 A	600 / 1200 A	600 / 1200 A	600 / 800 A	-
Fault-making	Symmetrical	12.5 kA	25 / 40 kA	25 / 40 kA	25 / 31.5 kA	-
Fault-making	Asymmetrical	20 kA	40 / 64 kA	40 / 64 kA	40 / 50.4 kA	-
Standards		IEEE C37.20.4, ANSI C37.58, CSA C22.2 No.193:M83

Downloads

CatalogsApr 30, 2026

[Susol LIS]Load Interrupter Switch

[Susol_LIS]Load_Interrupter_Switch_EN_C050N2-12-202604.pdf (56.13MB)

CertificatesJan 06, 2025

Component – Grounding Switches, Cat. No. UGS series Nomenclature: followed by “-”, followed by 05, 15, 27 or 38, followed by L or R, followed by 40, followed by D or E, may be followed by “EXPS”.

E533202-Vol1-Sec2-20241106.pdf

CertificatesJan 06, 2025

USL, CNL - Listed, Metal Enclosed Interrupter Switchgear, Over 600 V ac. Type HVL Load Interrupter Switchgear; Type Mini-Break Switchgear; Type LIVCB (Switch-over-Breaker)

E533202-Vol2-Sec1-20240521.pdf

CertificatesJan 06, 2025

Component - Load Interrupter Switch, Cat. No. ULI series Nomenclature: followed by “-”, followed by 05 or 15, followed by L, R, S or T, followed by 25, or 40, followed by C, followed by 06 or 12, followed by “-”, followed by A, may be followed by 1 or 2, may be followed by 3, 4 or 5, may be followed by “EXPS”.

E533202-Vol1-Sec1-20240122 Cert.pdf

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