JR28 Thermal Relay
Short Description:
JR28 series thermal relay are suitable for overload and phase-failure protection of AC motors with frequency of 50/60Hz, voltage up to 690V, current up to 0.1-150A under 8-hours duty or uninterrupted duty.
Detail
JR28 series thermal relay are suitable for overload and phase-failure protection of AC motors with frequency of 50/60Hz, voltage up to 690V, current up to 0.1-150A under 8-hours duty or uninterrupted duty.
Functions provided by these relays, are phase -failure protection, ON/OFF indication, temperature compensation, and manual/automatic reset.
Applicable Standard: GB 14048
International Standard: IEC 60947-4-1
The relays can be mounted onto contactors or installed as single units.
Protection Characteristics
| Item | NO. | Times the Setting current | Release time | Test condition | |
| Overload protection | 1 | 1.05 | >2h | Star from Cold Status | |
| 2 | 1.2 | <2h | Start From Hot status Right after item no.1 | ||
| 3 | 1.5 | <2m | |||
| 4 | 7.2 | 2s<Tp≤10s | Start from Cold status | ||
| Phase Failure protection | Any two phase | Another phase | |||
| 5 | 1.0 | 0.9 | >2h | Start from Cold status | |
| 6 | 1.15 | 0 | <2h | Start From Hot status Right after item no.5 | |
