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Siemens 7PU6020-7NN20 Star-Delta Timer Relay

Siemens 7PU6020-7NN20 star-delta timer relay for motor starting.

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ManufacturerSiemens

Part number7PU6020-7NN20

Type Star-Delta Time Delay Relay

Function Motor starting sequence

Setting Range 2 s to 20 s

Voltage 220-240 V AC 50/60Hz

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CAGE: 9NK75

Star-delta motor starting function Adjustable time delay (2-20s) 220-240V AC operation 1 delayed NO + 1 instantaneous NO contact Reduces motor starting current Compact design

Product description

The Siemens 7PU6020-7NN20 is a specialized star-delta (wye-delta) time delay relay designed for starting three-phase motors. It features a setting range of 2 to 20 seconds and operates on AC voltages of 220-240V at 50/60Hz. This relay provides one normally open (NO) delayed contact and one normally open (NO) instantaneous contact, crucial for the star-delta motor starting sequence. It does not include LED indicators.

This timer is essential for reducing starting current and torque in three-phase induction motors, protecting both the motor and the power supply. It is widely used in industrial applications such as pumps, fans, compressors, and conveyors where smooth motor start-up is required.

Stanlo Automation, a veteran-owned distributor, offers the Siemens 7PU6020-7NN20 as a surplus part. We provide reliable, cost-effective components to ensure your motor control systems are efficiently and safely operated.

Technical specifications

Type	Star-Delta Time Delay Relay
Function	Motor starting sequence
Setting Range	2 s to 20 s
Voltage	220-240 V AC 50/60Hz
Contacts	1 NO delayed + 1 NO instantaneous
Indicators	W/O LED

Common applications

Three-phase motor control

Pump applications

Fan applications

Compressor systems

Conveyor systems

Industrial machinery

Compatible systems

Three-phase motor starter panels Industrial motor control circuits Automation systems for motor applications

Also known as

Siemens 7PU6020-7NN20 timer Siemens star delta timer Siemens motor starter timer

Replaces / compatible with

This star-delta timer is designed to facilitate the transition from star to delta connection for three-phase motors. It is compatible with standard motor starter circuits.

Technical note

Expert tip

The 7PU6020-7NN20's integrated timing for the star-to-delta transition is critical for preventing mechanical stress and electrical surges during motor startup.

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Frequently asked questions

What is the primary function of the Siemens 7PU6020-7NN20 star-delta timer relay?

The primary function of the Siemens 7PU6020-7NN20 is to control the starting sequence of three-phase motors using the star-delta method. It manages the transition from a star connection (low starting current) to a delta connection (full running current) within a set time frame.