Repair
Repair Price: $ 1,108.00
Purchase
CSL Part Number: 25313
Product Overview: The Square D Life-Gard Model 85A is a microprocessor-based transformer temperature controller designed to monitor winding temperatures in power and distribution transformers. It continuously measures transformer coil temperatures via RTD sensors, automatically activating cooling fans when preset thresholds are reached and triggering alarms for over-temperature conditions. The controller features a digital LED display, configurable temperature setpoints (commonly H-80°C or H-150°C configurations), multiple relay outputs for fan and alarm control, and non-volatile memory for parameter storage. It is widely used in substations, industrial facilities, and data centers to protect transformers and extend equipment life.
Category: Temperature Control
Manufacturer: Square D
Alternate Manufacturer Names: Life-Guard, lifegard, Schneider Electric
Manufacturer Part Number: 85A
Series: Model 85A Transformer Fan Control
Brand: Life-Gard
Other Synonyms: Life-Guard, lifegard, Schneider Electric
Why replace your Life-Gard Fan Control System? Repair it at 1/4 the cost!
Common Failures
Frequent issues with this product include failed display, inability to silence alarms, non-functioning temperature controls, and defective components such as capacitors, EEPROM chips, and DIP switches. Problems with transformer leads and solder joints have also been identified, often leading to power-related issues and faulty readings on the display.
Repair Approach
Repairs typically involve replacing defective capacitors and EEPROM chips, resoldering connections, and reprogramming device settings to restore proper functionality. Routine cleaning and mechanical reassembly are also necessary in some cases. Diagnostics are performed to verify that components operate within specified parameters, and any necessary trace repairs are conducted.
Testing & Quality
Units undergo burn-in testing with load to verify fan and alarm operations at specified temperature setpoints. The testing procedure includes verifying calibration settings, proper operation of relays and memory functions, and confirming that customer settings are accurately restored. Units are thoroughly tested before being returned to service.
Service and repair your broken Square D part
We can repair your Square D model 85A in our facility. Let our skilled technicians get your Square D back in operation quickly.
Step 1 - Click the green 'Repair Now' button above to add the part and then complete the RMA.
Step 2 - The RMA form will be sent to you via email. Print the RMA form and put it in a box with the item(s) for repair.
Step 3 - Ship or mail the box to the address listed on the RMA.
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