Timer Relay Star Delta 100-380V SPTASD1-A2 Sparta

The Sparta SPTASD1-A2 is a Star Delta Timer Relay used in motor starter panels to control the changeover from star to delta. It handles both timing steps a star delta starter needs: T1 sets how long the motor runs in star, adjustable from 0.1 seconds up to 10 minutes, and T2 sets the short dead time between dropping the star contactor and pulling in delta, adjustable from 0.1 to 1 second.

That dead time is the part most panel builders care about. Without it, the star and delta contactors can briefly overlap and cause a phase to phase short. The SPTASD1-A2 gives you direct control over that gap, so you can tune it to the contactors actually fitted in the panel.

The wide AC/DC 100-380V operating range is the other reason this model gets specified. One unit covers 110V, 220V and 380V control supplies, so a panel shop can stock a single part instead of three. It mounts on standard 35mm din rail alongside the contactors and overload relay, with IP20 protection suited to enclosed panels.

Key Features

• Adjustable star run time from 0.1 seconds to 10 minutes

• Separate adjustable changeover dead time from 0.1 to 1 second

• Wide AC/DC 100-380V input covers most control supply voltages

• Output contacts rated 10/16A for direct contactor coil switching

• 35mm din rail mounting fits standard starter panel layouts

• Compact 113 gram body saves rail space

• Tight delay accuracy with basic error under 1 percent

Technical Specifications

Common Applications

Star delta starter panels for three phase induction motors, pump and compressor starters, fan and blower control panels, conveyor drive starters, HVAC plant rooms, irrigation and borehole pump panels, and any motor above the size where direct on line starting would pull too much inrush current.

Related Star Delta Timers and Starter Components

Supply voltage decides which model fits. If your control circuit runs on a lower voltage, the Star Delta Timer Relay 24-240V AC DC SPTASD1-A1 is the same Sparta unit with a 24-240V input range. Where the panel uses an 8 pin relay base instead of din rail, the Star Delta Timer 8pin 220VAC 5A ARD Anly is the plug in alternative from Anly Taiwan.

See all options in the Star Delta Timer range, or browse Digital and Analog Timers for countdown, twin and multi range timers.

A star delta starter needs more than the timer. The Magnetic Contactor range covers the three contactors a star delta panel uses, the Thermal Overload Relay range protects the motor, and the Motor Reversing and Star Delta Switch range covers manual changeover where no timer is used.

Why Buy From Qahraba

Qahraba supplies electrical contractors, panel builders and procurement engineers across the UAE and worldwide. Local UAE orders ship within 1 to 2 working days, or collect free from our Dubai store. Call or WhatsApp +971 52 913 9543 for bulk pricing or technical help.

FAQ,s

What does a Star Delta Timer Relay do?

It controls the two stage starting sequence of a star delta motor starter. It holds the motor in star for a set time, briefly opens both contactors, then switches to delta for normal running.

What is the difference between T1 and T2?

T1 is how long the motor runs in star before changeover, adjustable from 0.1 seconds to 10 minutes. T2 is the short gap between the star contactor opening and the delta contactor closing, adjustable from 0.1 to 1 second.

Why is the changeover dead time important?

If the star and delta contactors are ever closed together, you get a direct short between phases. The T2 setting makes sure star has fully released before delta pulls in.

Can the SPTASD1-A2 run on 220V and 380V?

Yes. It accepts AC or DC from 100V to 380V, so one unit covers most common control supply voltages without changing the part.

How does it mount in the panel?

It clips onto standard 35mm din rail, so it sits in line with the contactors, breakers and overload relay.

How long should the star time be set?

Long enough for the motor to reach around 75 to 80 percent of full speed, which is typically 5 to 15 seconds on most pump and fan loads. Check the motor and load data before setting it.