Starter Panels (DOL / Star-Delta / MCC)
Motor starter panels with robust protection and easy serviceability.
Technical data sheet
Motor Starter Panel (DOL / Star-Delta / Auto-Transformer)
Motor starter panel for 3-phase induction motors and submersible pump sets. DOL (≤ 5 HP), Star-Delta (5–60 HP), and Auto-Transformer (≥ 60 HP) variants with complete protection package.
Characteristics
| Motor Rating | HP | 1 to 200 |
|---|---|---|
| kW | 0.75 to 150 | |
| Starting method | — | DOL / Star-Delta / Auto-Transformer / Soft-Starter / Reactor |
| Supply | Volt | 380–415 (3Φ), 4-wire |
| Frequency | Hz | 50 |
| Short-circuit withstand | kA | 10 / 25 / 50 (rating dependent) |
| Enclosure | — | Powder-coated MS, IP54 / IP55 / IP65 |
| Protections | — | Overload, Short-circuit, Single-phasing, Earth fault, Under/Over voltage, Phase reversal |
| Control voltage | V AC | 230 (control circuit derived from supply) |
| Applications | Use | Pumps, Blowers, Compressors, Conveyors, Machine drives, Industrial loads |
Material of Construction — Power circuit
- Incoming MCCB / MCB: Per IEC 60947-2, ICU 25 / 50 kA
- Main contactor: AC-3 duty (Siemens / L&T / Schneider)
- Star contactor (S-D): AC-3 duty, sized to 1/√3 of full-load current
- Delta contactor (S-D): AC-3 duty, full-load current rated
- Auto-transformer: Dry-type, copper wound, 50/65/80% taps (large frames)
- Overload relay: Thermal / electronic with single-phasing protection
- Star-delta timer: Adjustable 0–60 sec, electronic
Material of Construction — Control & enclosure
- Control transformer: 230 V / 24 V (option), encapsulated
- Indicators: LED indicators (R-Y-B, Run, Trip, Star, Delta)
- Push buttons: Start / Stop / Reset (heavy-duty IP65 type)
- Selector switch: Manual / Off / Auto rotary
- Meters: Ammeter, voltmeter, hour-meter (digital)
- Enclosure: 1.6 / 2.0 mm MS, powder-coated RAL 7035, IP54/55/65
- Cable entry: Bottom gland plate with PG / brass glands
Salient Features
- DOL (Direct On-Line) — for motors ≤ 5 HP
- Star-Delta — for motors 5–60 HP, reduces inrush to ~33% of DOL
- Auto-Transformer — for ≥ 60 HP, 50% / 65% / 80% taps available
- Soft-starter option for jerk-free starting & extended motor life
- Time-delay timer for star-to-delta transition (factory pre-set)
- Single-phasing preventer & phase-reversal protection
- Thermal overload with single-phasing protection
- Earth-fault relay (optional)
- Indicators, meters, & push buttons on front panel
- Conforms to IEC 61439 / IS 8623
Applications
- 3-phase pump motor starting (submersible & surface)
- Blowers & compressors
- Conveyor & machine drives
- Mills, mixers & grinders
- Industrial fan motors
- Cooling tower fans
- Workshop & machinery starting
Star-Delta only applicable for motors with all 6 stator terminals accessible (delta-rated at supply voltage).
For frequent-start service (>20/hour), prefer soft-starter or VFD over electromechanical starter.
Have a question? Drop us a line.
Share your duty point — head, flow, voltage, application — and our engineering team will match the right configuration.
All configurations & variants
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Starter Panels (DOL / Star-Delta / MCC) for India, UAE, Saudi Arabia & Export Markets
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