Electrozad

The 3RB30 and 3RB31 electronic overload relays up to 115 A with internal power supply have been designed for current dependent protection of loads with normal and heavy starting and to protect 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 electronic 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 the current setting Ie and is stored in the form of a long term stable tripping characteristic curve. In addition to inverse time delayed protection of loads against excessive temperature rises due to overload, phase unbalance and phase failure, the 3RB31 electronic 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. The relay is reset manually or automatically after the recovery time has elapsed. The 3RB3 electronic overload relays are suitable for operation with frequency converters. 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 Electronic Overload Relay, Solid-State, 1 to 4 A, 0.55 to 3 kW Power, 50 to 60 Hz Frequency, 690 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 Mounting, Screw Terminal, IP20 Enclosure, -25 to 60 deg C, 87 mm H x 45 mm W x 84 mm D Dimensions

• Overload protection, phase failure protection and unbalance protection
• Internal power supply
• Manual and automatic reset
• Switch position indicator
• Test function and self-monitoring
• 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

• Specification Sheet https://uat.south.electrozad.com//ASSETS/DOCUMENTS/ITEMS/EN/SIRIUS_3RB3026_1PB0_Specification_Sheet.pdf