Siemens 3RP1574-1NP30 Electronic time relay

Product Detailed Description

• Functionality: This timing relay was an "ON-delay" type, meaning it provided a time delay after its control input was energized before its delayed contact changed state. It was specifically designed to support the "star-delta (wye-delta)" function, which is a common method for reducing the starting current of large AC motors.

• Contact Configuration: It featured a combination of contacts:

• 1 NO (Normally Open) delayed contact: This contact would close after the set time delay had elapsed.

• 1 NO (Normally Open) instantaneous contact: This contact would close immediately when the control input was energized, without any delay. This instantaneous contact is typically used in star-delta starters to control the "star" contactor, while the delayed contact controls the "delta" contactor.

• Time Range: It offered a single, fixed time range for adjustment, typically from 1 to 20 seconds.

• Supply Voltage: It had a wide supply voltage range, making it versatile for different power systems:

• 24 V AC/DC

• 200 to 240 V AC at 50/60 Hz

• Connection: Utilized screw terminals for secure and reliable electrical connections.

• Mounting: Designed for standard DIN rail mounting, allowing for easy integration into control cabinets.

• Applications: Used in applications where specific time delays are required for switching operations, particularly in motor control schemes like star-delta starting to smoothly transition a motor from a star connection to a delta connection.

Product Parameters

• Type: Electronic Timing Relay

• Function: ON-delay with star-delta (wye-delta) function

• Time Range: 1 to 20 seconds (single time range)

• Contact Configuration: 1 NO (delayed) + 1 NO (instantaneous)

• Contact Rating:

• 3A at 250 VAC

• 3A at 24 VDC

• R300 / B300 (NEMA rating for pilot duty contacts)

• Coil Voltage (Supply Voltage):

• 24 V AC/DC

• 200 to 240 V AC at 50/60 Hz

• Operating Cycles (Mechanical Life): 10 million cycles

• Operating Temperature: -25 °C to +60 °C

• Enclosure / IP Rating: IP20 (protection against solid objects >12.5mm, no protection against water)

• Mounting Type: Screw and Snap-on (DIN Rail)

• Dimensions (approximate, varies slightly by source):

• Width: Approx. 22.5 mm (typical for this series)

• Net Weight: Approx. 0.113 kg (0.249 lb)

• Compliance: Designed to meet relevant international standards for industrial control equipment.

Product Advantages (at the time of its active production)

• Cost-Effectiveness: Provided an affordable solution for implementing time delays in control circuits.

• Space Management: Compact design helped in optimizing space within control panels.

• Versatile Power Supply: Dual voltage capability (AC/DC and wide AC range) reduced inventory needs and offered flexibility.

• Reliable Performance: Electronic design offered precise and repeatable timing compared to older mechanical timers.

• Integrated Star-Delta Functionality: Specifically designed with the star-delta starting sequence in mind, simplifying wiring for such applications.

• Siemens Quality: Benefit from Siemens' reputation for quality and reliability in industrial control components.

Shipping Port: Xiamen, China

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