RW27-2D thermal overload relays are designed to be mounted directly with CWB contactors for easy connection to the motor. Thermal overload relays have no power contacts and cannot disconnect the motor by itself. Motor overloads or phase failures increase the motor current (A), this increase triggers the internal mechanism to trip and simultaneously open the auxiliary contacts, safely disconnecting the motor and protecting it from excessive heating and damage. The auxiliary contacts, when properly wired in series with the coil of the contactor, will deenergize the coil in the event of a motor overload. Thus, the contactor disconnects the power to the motor and stops its operation. By design, thermal overload relays have built in thermal memory and once tripped, the relay cannot be reset until the bimetallic strips cool down; thereby allowing the motor to cool before it can be started again
Specifications
Reference | RW27 |
---|---|
Number of poles | 2 poles |
Mounting type | Direct |
Contactor model | CWB9-38 |
Mounting configuration | 2D |
Rated insulation voltage Ui | 690 V |
Rated insulation voltage Ui (acc. to UL) | 600 V |
Rated impulse withstand voltage Uimp | 6 kV |
Rated operational frequency | 25...400Hz |
Suitable for use with DC loads | Yes |
Maximum operating frequency | 15 ops./h |
Degree of protection - main terminals | IP10 |
Degree of protection - auxiliary terminals | IP20 |
Current range | 22-32 A |
Max. Fuse (type 2 coordination) | 63gL/gG |
Short circuit protection with fuses (gL/gG) | 6gL/gG |
Height | 72 mm / 2.83 in |
Width | 45 mm / 1.77 in |
Depth | 82 mm / 3.23 in |
Gross weight | 0,165 kg / 0.36 lb |