Use the following chart to compare the protective funtions of Eaton's E-series transformer relays.
Serial Number Verified :
Authenticated: ![]()
The product is verified as being authentic; however, this does not guarantee the condition or fit for purpose of the product.
The product is verified as being authentic; however, this does not guarantee the condition or fit for purpose of the product.
Eaton transformer relay
Eaton’s Transformer Relays (ETR4000 and ETR5000) provide users with superior control and backup protection. Instantaneous overcurrent elements allow for quick clearing of severe internal or external faults, and maintenance mode enhances overall safety and protection by reducing fault clearing time and lowering incident energy levels. The ETR’s zone-selective interlocking feature and trip and event recording feature help reduce troubleshooting time, maintenance requirements, and overall costs.
Eaton’s transformer relay family–EMR Series
ETR-4000 transformer relay
46— Current unbalance elements
87R— Dual-slope percentage restrained current differential with magnetizing inrush and over-excitation blocking
87H— Unrestrained current differential
87GD— Restricted ground fault / ground differential
50P— Instantaneous overcurrent elements with timers
50R— Instantaneous calculated elements with timers
50X— Instantaneous measured elements with timers
51P— Inverse time overcurrent elements
51Q— Negative sequence phase overcurrent elements
51R— Inverse time overcurrent calculated elements
51X— Inverse time overcurrent measured elements
BF— Breaker failure elements
49— Temperature protection
SOTF— Switch onto fault protection
CLPU— Cold load pickup
74TCM— Trip coil monitor
ZI— Zone selective interlocking for bus protection
BF— Breaker failure
ETR-5000 transformer relay
The ETR-5000 has all of the same protection functions as the ETR-4000 with additional features.
47— Voltage unbalance elements
27M/59M— Main three-phase under/overvoltage protection
27A/59A— Auxiliary single-phase under/overvoltage protection
81— Frequency elements that can be assigned to: overfrequency, underfrequency, rate of change or vector surge
32— Forward and reverse watts protection
32V— Forward and reverse VARs protection
24— Over-excitation, volts-per-hertz protection
86— Lockout protection
51V— Voltage restraint elements
27T— Low voltage ride-through (LVRT)
27Q— Reactive power and undervoltage
LOP— Loss of potential
Typical one-line example—ANSI protective elements guide
Protective elements key
Functions on ETR-4000
Functions on ETR-4000 and ETR-5000
Improved coordination
Zone selective interlocking
Maintenance mode
Improves worker safety
Common software tools
All E-series relays, including our E-series motor relays, use the same software interface for easy access to information and programming of settings. Whether you are using the front panel or the external software, the interface is the same on all models.
- Operation
- System Parameters
- Protection Parameters
- Device Parameters
- Control
- Logic
- Device Planning
- Service
Eaton's E-Series Relays
Core features
- An unrestrained differential element provides fast tripping on heavy internal faults to limit catastrophic damage to the transformer and minimize risks to the remainder of the power system.
- Instantaneous overcurrent elements allow quick clearing of severe internal or external (through) faults.
- Front panel LCD display with background illumination allows for wide angle viewing in all light conditions, and 14 programmable LEDs provide quick and easy visual display of power on, mode of operation, alarm, and trip indication.
- Maintenance Mode improves safety by providing a simple and reliable method to reduce fault clearing time and lower incident energy levels at energized panels.
- Complete protection and control in a single compact case reduces panel space, wiring, and costs.
- Integral test function reduces maintenance time and expense.
- Zone selective interlocking improves coordination and tripping time, and saves money compared to a traditional bus differential scheme.
- Trip and event recording in non-volatile memory provides detailed information for analysis and system restoration, reducing trouble shooting time and maintenance costs.
- Breaker trip circuit monitoring improves the reliability of the breaker operation.
- 4 Voltage inputs provide 3 phase voltage protection and metering information as well as an independent single phase voltage input.
Unmatched protection
Eaton’s E-Series microprocessor-based protective relays offer reliable, secure and complete protection and control of power generation and distribution systems. Transformer relays specifically provide you primary protection, control and backup protection of transformers.
How to buy from Eaton
