SIEMENS
SIEMENS 3RU21160BB0 Overload Relay 0.14-0.20 A 690 V AC
Thermal overload relay protects motors at 0.14–0.20 A with 690 V AC rating and direct contactor mounting
- Thermal protection for motors with 0.14–0.20 A setting range
- Trip Class 10 ensures reliable overload response
- Direct contactor mounting simplifies panel assembly
- Screw terminals provide secure wiring connections
- Auto and manual reset options suit different maintenance needs
SIEMENS 3RU21160BB0 Overload Relay
The SIEMENS 3RU21160BB0 is a thermal overload relay rated for 0.14 to 0.20 amperes at up to 690 volts AC. It provides motor protection in industrial control panels and machinery applications where precise current monitoring is required. The relay mounts directly to a compatible SIRIUS series contactor using screw terminals for secure wiring. It suits maintenance engineers and panel builders specifying IEC-style protection for small motors.
Check contactor frame and wiring before ordering
Verify that the existing contactor uses frame size S00 and supports direct mounting to this relay. Confirm the control circuit can accommodate the 1NO/1NC auxiliary contact configuration for trip signalling. Ensure the supply voltage does not exceed 690 volts AC and that three thermal units are present for three-pole protection. The screw terminals accept standard ferrules or bare wire for the power connections.
Thermal trip responds to sustained overcurrent
Trip class 10 means the relay opens within a defined time under continuous overload rather than during brief inrush currents. The bimetallic elements heat proportionally to motor current, providing reliable protection against prolonged excessive load. Auto and manual reset modes allow either automatic restart after cooling or deliberate operator intervention. The thermal design maintains consistent trip behaviour across the 0.14 to 0.20 ampere setting range.
Highlights
- Thermal protection for motors with 0.14–0.20 A setting range
- Trip Class 10 ensures reliable overload response
- Direct contactor mounting simplifies panel assembly
- Screw terminals provide secure wiring connections
- Auto and manual reset options suit different maintenance needs
Specifications
| Brand | SIEMENS |
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Questions about this item
Does the 3RU21160BB0 overload relay ship with its thermal units or must they be ordered separately?
Thermal units are included with the relay so no separate purchase is required.
Should I choose the 0.14 A minimum or the 0.20 A maximum setting for my motor?
Set the dial between 0.14 A and 0.20 A to match the motor full-load current; the adjustable range covers both values.
What does the 690 V AC rating mean when the relay is installed in a control panel?
The relay can be applied in circuits up to 690 V AC, which is the maximum system voltage the insulation is rated for.
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