Electrozad

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 "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. In addition to inverse time delayed protection of loads against excessive temperature rises due to overload, phase unbalance and phase failure, the 3RB21 solid state overload relays also allow internal ground fault detection (not possible in conjunction with contactor assemblies for wye-delta starting). This provides protection of loads against high resistance short circuits due to damage to the insulation material, moisture, condensed water etc. The "tripped" status is signaled by means of a switch position indicator. Resetting takes place either manually or automatically after the recovery time has elapsed. The devices are manufactured in accordance with environmental guidelines and contain environmentally friendly and reusable materials. They comply with all important worldwide standards and approvals.

SIRIUS Overload Relay, Solid-State, 50 to 200 A, 50/60 Hz Frequency, 1000 VAC Coil, 1NC-1NO Contact Form, 4 A at 24/110/120/125 VAC, 3 A at 230 VAC, 2 A at 24 VDC, 0.55 A at 60 VDC, 0.3 A at 110/125 VDC, 0.11 A at 220 VDC Contact, 3 Pole, Contactor/Stand Alone Mounting, Screw Terminal, IP20 Enclosure, -25 to 60 deg C, 119 mm H x 120 mm W x 155 mm D Dimensions

• Manual automatic reset
• Switch position indicator
• Test function
• Reset button
• 4 A at 24/110/120/125 VAC, 3 A at 230 VAC operating current of auxiliary contacts at AC-15, 2 A at 24 VDC, 0.55 A at 60 VDC, 0.3 A at 110/125 VDC, 0.11 A at 220 VDC operating current of auxiliary contacts at DC-13

• Catalog https://uat.south.electrozad.com//ASSETS/DOCUMENTS/ITEMS/EN/SIRIUS_3RB2036_1QB0_Catalog.pdf
• Specification Sheet https://uat.south.electrozad.com//ASSETS/DOCUMENTS/ITEMS/EN/SIRIUS_3RB2056_1FW2_Specification_Sheet.pdf