Three Phase Digital Auto Switch Comparison

VUKAR makes three three phase digital auto switch models: DEV-P1, DEV-P2 and DEV-N. All three are listed for 2 HP to 100 HP motors and include an auto switch, VUKAR motor safety, a cyclic timer, a single phase preventer and a phase sequence detector. DEV-P1 and DEV-P2 are the current DEV-P range; DEV-N is the separately listed model. The table below shows only what actually differs between them.

None of the three phase auto switches include a water level controller. If you need automatic tank control, use a DEV-G three phase water level controller, or a DM-TP digital meter with LLC or RTLC in the code.

Quick answer: which three phase digital auto switch do you need?

  • You want the pump to restart on its own when power returns — any of the three. All list automatic power-on start.
  • You want the pump to run at fixed times of day — choose DEV-P2. It is the only three phase auto switch with a clock timer and a digital clock display.
  • You need complex daily or weekly schedules — choose DEV-P2. It is the only one that adds the multi-event real-time scheduler (up to 20 programs), the hierarchical timer, total daily runtime control and user settable operating hours for the cyclic timer.
  • You want fault logging and run-time data — choose DEV-P1 or DEV-P2. Both list a motor fault counter and a total run time counter.
  • You want a borewell recharge timer by name — choose DEV-N. It is the only model that lists a borewell recharge timer; DEV-P1 and DEV-P2 instead list a programmable auto-restart dry run timer.

Comparison table: all three phase digital auto switch models

Model HP range Clock Timer Multi-Event / Hierarchical Scheduler Motor Fault Counter & Run Time Counter Overload Safety Lockout Auto Off / Stop Timer
DEV-N 2–100 HP No — — — —
DEV-P1 2–100 HP No No Yes Yes Yes
DEV-P2 2–100 HP Yes Yes Yes Yes Yes

A dash means the product page does not state that specification. The cyclic timer, the auto switch, motor safety, the single phase preventer and the phase sequence detector are listed on all three models, so they are not shown as columns. No three phase auto switch has a water level controller, a water level indicator, a float switch or an MCB.

How the model codes work

DEV-P is the current three phase digital auto switch range: P1 has the cyclic timer, and P2 adds the clock timer and the advanced scheduling features. DEV-N is listed separately and describes a shorter feature set — a cyclic timer and a borewell recharge timer. The single phase equivalent is the DEV-K series.

Frequently asked questions

What is the difference between DEV-P1, DEV-P2 and DEV-N?

DEV-P1 has a cyclic timer, fault and run-time counters, an overload safety lockout and an auto off / stop timer. DEV-P2 is DEV-P1 plus a clock timer, a digital clock display and advanced scheduling. DEV-N lists a cyclic timer and a borewell recharge timer; its product page does not state fault counters, an overload safety lockout or an auto off / stop timer.

What HP range do the VUKAR three phase auto switches cover?

All three are listed for 2 HP to 100 HP motors.

Which three phase auto switch has a clock timer?

Only DEV-P2. It also adds a digital clock display, the multi-event real-time scheduler with up to 20 programs, the hierarchical timer, total daily runtime control and user settable operating hours for the cyclic timer.

Do the three phase auto switches include a single phase preventer?

Yes. DEV-P1, DEV-P2 and DEV-N all list a single phase preventer and a phase sequence detector, so it is not a reason to pick one model over another.

Do the three phase auto switches include a water level controller?

No. None of the three has a water level controller or a water level indicator. For automatic tank control, use a DEV-G three phase water level controller, or a DM-TP digital meter with LLC or RTLC in the code.

What motor protection do the three phase auto switches have?

DEV-P1 and DEV-P2 list overvoltage and undervoltage protection, overload and dry run protection, a single phase preventer and phase sequence detector, an overload safety lockout and a programmable auto-restart dry run timer. DEV-N lists motor overload protection, motor dry run protection, voltage protection, a single phase preventer and a phase sequence detector.

What is the warranty on DEV-N?

The DEV-N product page states a 1 year warranty, with extended 2 year and 3 year warranty available. The DEV-P product pages do not state a warranty period.

What is the single phase version of DEV-P?

The DEV-K series, rated 1 to 35 A or 5 to 200 A. See the single phase digital auto switch comparison.

What is the difference between these devices and a VUKAR starter panel?

The products on this page are sold as control units on their own. A VUKAR starter panel is a complete ready-to-install panel. If you want a complete three phase panel, see the three phase DOL starter panel comparison.

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