Modular Time Relay | Timer | For Three-Phase Motor Starting | 0.1-30s | 1-500ms | 5A | 150-260VAC / 24VAC/DC | DIN

The nominal supply to the relay via A1–A2 terminals is 230V AC. The manufacturer's specified overall operating voltage range Un is 150–260V AC. Alternatively, the relay can be powered with 24V AC/DC via A2–A3 terminals.

This relay is not intended to switch the three-phase motor power circuit directly. The STAR and DELTA outputs are used to control the contactor coils. The motor power circuit must be switched through correctly selected main, star and delta contactors together with appropriate protective devices.

Power applied → STAR output switched on → preset STAR time counted → STAR switched off → 1–500ms pause → DELTA output switched on → operating state until power is disconnected.

The optimum time depends on the motor power, mechanical load, system inertia and actual acceleration time. It is recommended to verify the setting under real operating conditions.

The timer relay alone is not sufficient as the only protection against simultaneous activation of the STAR and DELTA contactors. The control circuit must include electrical interlocking and, where required by the project, mechanical interlocking as well.

A1–A2 = 230V AC indicates the nominal supply connection, while Un = 150–260V AC specifies the permissible operating voltage range. This means that the relay is intended for a 230V AC system but can operate within the manufacturer's specified 150–260V AC range.

The specified 5A contact current applies to the relay control outputs. The motor power circuit must not be switched directly through these contacts. The motor current is switched by the corresponding power contactors.

• The motor must have six accessible winding terminals.
• The motor windings must be suitable for operation in delta at the applied mains voltage.
• The mechanical load being started must allow the reduced starting torque of star operation.
• The main, STAR and DELTA contactors must be correctly selected.
• The motor must have suitable overload and short-circuit protection.
• The STAR and DELTA contactors must be interlocked.
• The connection diagram must correspond to the specific motor nameplate and project design.

In star mode, not only the starting current but also the motor starting torque is reduced. Therefore, this starting method may not be suitable for mechanisms that require high torque from the moment of start-up.

• Automatic STAR-DELTA starting sequence.
• Adjustable 0.1–30s star operating time.
• Adjustable 1–500ms transition pause.
• Separate STAR and DELTA relay outputs.
• ON, STAR and DELTA LED indication.
• 150–260V AC operating voltage range.
• 230V AC supply via A1–A2.
• Alternative 24V AC/DC supply via A2–A3.
• 5A / 250V AC control contacts.
• Power consumption below 4VA.
• DIN rail mounting.
• Operating temperature from −20 to +55°C.

• The motor power circuit must not be switched directly.
• Main, STAR and DELTA contactors are required.
• Interlocking between STAR and DELTA contactors is mandatory.
• Not suitable for all three-phase motors.
• Not suitable for loads requiring high starting torque.
• The 5A contact rating must be evaluated according to the contactor coil load.
• The exact timing accuracy is not specified.
• The degree of protection against dust and moisture is not specified.
• Not intended for exposed outdoor installation.

A three-phase fan motor is controlled by main, STAR and DELTA contactors. The motor star starting time is set to 8 seconds.

When power is applied to the relay, the STAR output is activated. The star contactor connects the motor windings in star and the motor begins to accelerate with reduced starting current.

After 8 seconds, the STAR output is switched off. The relay then starts, for example, a 100ms transition pause during which both outputs are inactive.

After the pause has elapsed, the DELTA output is switched on, the delta contactor operates and the motor changes to normal operating mode.

The DELTA output remains active until the relay supply voltage is disconnected.

For automatic control of the STAR and DELTA contactor starting sequence of a three-phase motor.

Adjustable from 0.1 to 30 seconds.

From 1 to 500ms.

STAR is already switched off, while DELTA has not yet been switched on. Both outputs are inactive.

230V AC.

150–260V AC.

Yes. A2–A3 terminals are intended for 24V AC/DC supply.

50/60Hz when AC power is used.

No. The relay controls the contactor coils, while the motor power circuit is switched by the contactors.

Yes. The contact rating is 5A / 250V AC, but for contactor coils the inductive load must be taken into account.

Yes. The contactors must be electrically interlocked and, depending on the project design, mechanically interlocked as well.

No. The motor must be suitable for star-delta starting and have six accessible winding terminals.

It reduces the motor starting current, but also reduces the starting torque.

It indicates that the relay is powered and the control cycle is active.

It indicates that the star contactor control output is active.

It indicates that the delta contactor control output is active.

Disconnecting and reconnecting the relay power restarts the STAR-DELTA sequence.

The relay must be installed by a qualified electrical specialist. Before installation or servicing, all control and power circuits must be disconnected. A1–A2 terminals are intended for nominal 230V AC supply, while the manufacturer's specified Un operating voltage range is 150–260V AC. A2–A3 terminals are intended for alternative 24V AC/DC supply.

The motor power circuit must not be connected directly through the contacts of this relay. The STAR and DELTA contactors must be correctly selected and interlocked. Simultaneous activation of the star and delta contactors can cause a short circuit in the power circuit.