Agricultural Power Products
Starters and protection gear engineered for pump sets and other agricultural electrical loads.
About Agricultural Power Products
Agricultural pump sets work on some of the hardest supplies an electric motor sees: wide voltage swings, frequent outages, phase loss and long cable runs out to the field. A properly selected starter protects the motor through all of this and keeps irrigation running.
Microtech supplies Lauritz & Knudsen agricultural starters, including the MK1 and MK2 series used on farm pumps across India for decades. Direct-on-line starters cover smaller pumps and star-delta starters reduce the starting current of larger ones; both use a wide-band coil that holds in across roughly 200–400 V, so the starter does not chatter or drop out on a weak rural feeder. The enclosure is built to keep out dust, humidity and insects.
For three-phase pumps, the starter can be paired with a single-phasing protection relay that trips on phase loss, unbalance or reversal, and with a dry-run protection device for borewells. We help farmers, dealers and contractors pick the starter and overload range from the motor rating.
Key specifications
| Starter types | DOL and star-delta; single-phase and three-phase variants |
|---|---|
| DOL starters (MK series) | Up to 7.5 HP |
| Star-delta starters (MK series) | Up to 15 HP, fully automatic or semi-automatic |
| Overload relay ranges | MK1 up to 13–22 A; MK2 20–32 A |
| Coil | Wide-band, operating from about 200 V to 400 V |
| Range coverage | L&K agricultural starters for pumps up to 35 HP |
| Protection add-ons | Single-phasing protection relay (SPPR) and dry-run protection device |
| Contacts | Silver-tipped, with ON/OFF indication |
Features & benefits
- Wide-band coil that tolerates low and fluctuating rural supply voltage
- Thermal overload protection matched to the pump motor current
- Single-phasing, unbalance and phase-reversal protection with an SPPR
- Dry-run protection option for borewell and submersible pumps
- Enclosure that keeps out dust, moisture and insects
- Simple ON/OFF operation with clear status indication
Where it’s used
- Borewell and submersible irrigation pumps
- Surface and monoblock pump sets
- Canal and lift irrigation pumping
- Small rural three-phase motor loads
- Dairy, poultry and farm utilities
Agricultural Power Products — FAQs
Should I use a DOL or star-delta starter on my pump?
Small pumps are normally started direct-on-line. Larger motors draw a heavy current at start, so a star-delta starter is used to reduce it — L&K MK DOL starters go up to 7.5 HP and star-delta up to 15 HP. Check the motor nameplate and your electricity supplier's rules on starting current.
Why does my pump motor burn out on a rural feeder?
The usual causes are single phasing, very low voltage and dry running. A starter with a correctly set overload relay, together with a single-phasing protection relay and dry-run protection, guards against all three.
How do I choose the overload relay range?
Set it to the full-load current on the motor nameplate, and pick the relay range so that this current falls within the adjustable band. If you share the HP and current, we will recommend the correct starter and relay.
