Reliable Type 2 AC Surge Protection for Three-Phase Circuits
LY1-C40/3(S) is a three-pole pluggable Type 2 AC surge protective device designed for three-phase low-voltage distribution systems. Its high-energy MOV modules provide fast transient-voltage limitation with 20kA nominal discharge current and 40kA maximum discharge current, while the replaceable cartridge design simplifies inspection and maintenance.
Class II / Type 2 protection for three-phase AC systems
Three-pole design for coordinated multi-phase protection
20kA nominal and 40kA maximum discharge current
Pluggable cartridges with visual indication and optional remote contact
Suitable Applications
LY1-C40/3(S) is suitable for three-phase AC systems requiring modular Type 2 surge protection in distribution boards, industrial control panels, commercial buildings, and solar AC power systems.
Three-Phase Distribution Boards
For Type 2 surge protection in commercial and industrial three-phase distribution panels.
Industrial Control Panels
Suitable for machinery controls, factory automation, HVAC systems, and electrical equipment cabinets.
Commercial Buildings
Helps protect office buildings, retail facilities, and commercial electrical systems from transient overvoltage.
Solar Inverter AC Panels
For three-phase solar inverter AC-side panels when the selected Uc version matches the system voltage.
FAQ
Common questions about LY1-C40/3(S) three-pole pluggable Type 2 AC surge protective device selection and installation.
What is LY1-C40/3(S) used for?
LY1-C40/3(S) is used to limit transient overvoltage in three-phase low-voltage AC systems. It is suitable for distribution boards, industrial control cabinets, machinery power panels, and commercial electrical systems.
Is LY1-C40/3(S) a Type 2 SPD?
Yes. LY1-C40/3(S) is classified as a Class II / Type 2 AC surge protective device. The incorrect Type 1CA wording should not be used.
What discharge current ratings does it provide?
The SPD provides 20kA nominal discharge current In and 40kA maximum discharge current Imax. The technical table also lists a 7kA impulse-current parameter.
What voltage options are available?
Maximum continuous operating voltage options include 75V, 150V, 275V, 320V, 385V, and 440V AC. Select the correct version according to the nominal system voltage.
What is the benefit of the pluggable design?
Each cartridge can be inspected or replaced independently without removing the permanently wired base, reducing maintenance time and simplifying servicing.
What should be confirmed before ordering?
Confirm the nominal system voltage, required Uc and Up level, three-pole protection arrangement, 125A maximum backup-fuse coordination, conductor size, DIN-rail space, and remote-contact requirement.
