Description
Siemens SIRIUS Overload Relay, Solid-State, 690 VAC Coil, 1NC-1NO Contact Form, 50 A at 690 VAC Contact, 3 Pole, Contactor Mounting, Threaded Terminal, IP00 Enclosure, -25 to 60 deg C, 92 mm H x 55 mm W x 109 mm D Dimensions
The 3RB20 and 3RB21 solid state overload relays up to 630 A with internal power supply have been designed for inverse time delayed protection of loads with normal and heavy starting (see technical information LV 1 T, "Function") against excessive temperature rises due to overload, phase unbalance or phase failure. An overload, phase unbalance or phase failure result in an increase of the motor current beyond the set rated motor current. This current rise is detected by the current transformers integrated into the devices and evaluated by corresponding solid state circuits which then output a pulse to the auxiliary contacts. The auxiliary contacts then switch off the load by means of a contactor. The break time depends on the ratio between the tripping current and current setting Ie and is stored in the form of a long term stable tripping characteristic.
Features
- Overload protection, phase failure protection and unbalance protection
- Internal power supply
- Manual and automatic reset
- Switch position indicators
- TEST function and self-monitoring
- Size S2
- Class 5 to 30
- Device is directly mounted onto the contactor
- Devices are manufactured in accordance with environmental guidelines and contain environmentally friendly and reusable materials
- -40 to 80 deg C environmental conditions
Specifications
GTIN: 00040892553567
UNSPSC: 39122330
Alternative Part Number: 11063878
Coil Voltage | 690 VAC |
---|---|
Contact Form | 1NC-1NO |
Contact Rating | 50 A at 690 VAC |
Dimensions | 92 mm H x 55 mm W x 109 mm D |
Enclosure Type | IP00 |
Mounting Type | Contactor |
Number of Poles | 3 |
Temperature Rating | -25 to 60 deg C |
Terminal Type | Threaded |
Type | Solid-State |
Sold as | EACH |
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