What is an Automatic Transfer Switch?

An ATS automatically switches the load between mains supply and DG (diesel generator) source. When mains fails, the DG starts and the ATS transfers the load to the DG; when mains returns, it switches back — all without manual changeover.

Do I need a 2 pole or 4 pole ATS?

2 pole ATS for single phase loads — shops, clinics, small offices. 4 pole for three phase loads — apartment blocks, factories, commercial buildings with 3 phase DG.

Can an ATS work with a solar + grid setup?

Yes — with proper configuration, ATS can prioritise solar / inverter output over grid. Share your source list (grid / solar / DG) on WhatsApp for correct sizing.

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Category · ATS (Automatic Transfer Switch)

Automatic Transfer Switch Supplier in Chennai — Lauritz Knudsen (L&K) 2P & 4P

Seamless mains / DG changeover for shops, clinics, apartments and factories. Lauritz Knudsen (L&K) automatic transfer switches support 2 pole (single phase) and 4 pole (three phase) sources with motorised changeover.

Browse Lauritz Knudsen (L&K) range Bulk quote

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2-pole ATS — 2 pole ATS for single phase. Shops, clinics, small offices, rental housing.
4-pole ATS — 4 pole ATS for 3 phase DG source. Apartments, factories, commercial 3 phase loads.

Typical use cases

Premise	Load	Recommended ATS
Clinic / chemist shop	Single phase, 3–5 kW	ATS 2P
Retail showroom	Single phase, up to 10 kW	ATS 2P
Small office	Single / 3 phase	ATS 2P or 4P per supply
Apartment block	3 phase DG backup	ATS 4P
Small factory	3 phase, 25–100 kW	ATS 4P

FAQ

Does the ATS start the DG automatically?

ATS handles the switchover; DG auto-start is handled by the DG's AMF panel. Typical setup: ATS + AMF panel work together so mains failure triggers DG start, then ATS transfers load to DG output once voltage is healthy.

What warranty do you give?

1-year brand warranty on Lauritz Knudsen (L&K) ATS. Service through Santosh Electricals direct.

Can ATS fit in existing panels?

Yes — Lauritz Knudsen (L&K) ATS are DIN rail mount compatible. Most panel builders integrate without rework. Share your panel drawing and we confirm fit.