Description
Hitachi TR80B-1E Thermal Overload Relay AC600V 3-Phase 80-105A Motor Protection
The Hitachi TR80B-1E is a three-pole bimetal thermal overload relay rated for AC600V service. It provides overcurrent and overload protection for three-phase motors and is designed to mount directly onto a compatible Hitachi magnetic contactor or motor starter assembly. The current-setting dial is adjustable and visible on the front face, allowing the trip threshold to be tuned to the connected motor's full-load current rating.
Specifications & What's Included
- Model: TR80B-1E
- Manufacturer: Hitachi, Ltd. — Tokyo, Japan
- Voltage Rating: AC600V
- Current Setting Range: approximately 80–105A (dial markings visible: 80, 70, 55 range scale)
- Number of Poles: 3 (three-phase)
- Contact Rating — NO (a): AC220V, 1A (Hand/Auto: 0.5A)
- Contact Rating — NC (b): AC220V, 2A (Hand/Auto: 1A)
- Reset Mode: Manual / Auto selectable (Hand/Auto lever)
- Trip Indicator: Yellow flag indicator on front
- Reset Button: Red push-button on front face
- Mounting: Integral zinc-plated mounting bracket; compatible with DIN rail and panel mount installations
- Auxiliary Contact Block: Present on right side of unit
- Condition: Relay unit only — no contactor included
Applications
Thermal overload relays like the Hitachi TR80B-1E are a standard component of motor control circuits in industrial and commercial electrical systems. They protect three-phase motors from damage caused by sustained overcurrents — conditions such as a jammed load, phase loss, or an undersized motor running above its rated current. When the bimetal element inside the relay heats beyond the set threshold, the relay trips and opens the control circuit, stopping the contactor and de-energizing the motor before winding damage occurs. The TR series is commonly used alongside Hitachi H-series and N-series magnetic contactors in motor control centers (MCCs), machine tool panels, pump control panels, conveyor systems, HVAC compressor starters, and general industrial automation equipment. This relay dates from an era — evident from its construction style, Tokyo Japan marking, and terminal layout — consistent with 1980s–1990s Japanese industrial switchgear. Surplus TR-series relays remain in active use today for maintenance and replacement in legacy Hitachi motor starter assemblies where the original relay has worn out or tripped and failed to reset.
This Hitachi TR80B-1E Thermal Overload Relay has been inspected and is in good used condition. It was pulled from a working environment where it was in active use. The body and terminal block are clean and intact. The mounting bracket shows some surface iridescence typical of aged zinc plating but is structurally sound. The current-setting dial and red reset button are present and undamaged, and the trip indicator is intact. No signs of burning, arc damage, or terminal corrosion are visible. Please view our photo set and contact us if you have any questions.
Warranty Information
Additional Information
Brand: |
Hitachi |
Model: |
TR80B-1E |
MPN: |
TR80B-1E |
Type: |
Thermal Overload Relay |
SKU: |
45550 |
Voltage Rating: |
AC600V |
Current Setting Range: |
80–105A |
Number of Poles: |
3 |
Phase: |
Three Phase |
Contact Rating NO (a): |
AC220V: 1A; Hand/Auto: 0.5A |
Contact Rating NC (b): |
AC220V: 2A; Hand/Auto: 1A |
Reset Type: |
Manual / Auto (Hand/Auto selectable) |
Trip Indicator: |
Yes — yellow trip flag indicator |
Mounting: |
DIN Rail / Panel Mount with bracket |
Country/Region of Manufacture: |
Japan |
Condition: |
Used – Pulled from Working Environment |
Seller Notes: |
Relay only; no contactor included. Pulled from working environment. |
Compatible With: |
Hitachi TR series contactor/starter systems |
Serial Number Prefix: |
28H99 (see internal fields) |
Condition Notes: |
Hitachi TR80B-1E Thermal Overload Relay, AC600V, 80–105A. Used, pulled from a working environment. Inspected — clean, no burn marks or terminal damage. Dial and reset button intact. |
