ES Series, Protection Relays

ES Series Protection Relays provide a wide range of cost-saving options to simplify protection related to Generator, Transformer, Distribution, Process Control, Auto Transfer Schemes, and Motor applications. ES relays offer many high-end features not typically found in a low-cost device to provide simple, yet sophisticated, protection for your applications. Multiple DIN-rail mounting options are available.

Benefits
Manuals
Bulletins
Technical Resources
Applications
Case Studies

Benefits

Simplify protection by covering a wide range of applications using ES relays.
Sophisticated fundamental sensing technology gives you high-end harmonic protection capabilities that prevent false tripping and allows you to be more selective.
DIN-rail mounting provides low-cost, fast, easy, and compact installation.
Relay settings are simple and intuitive, making setup fast with no PC required.
Red and green LEDs on the front panel provide intuitive, easy-to-understand indication of system status.
Digital microprocessor design is extremely accurate to ensure a high level of dependability and security, giving you confidence in your settings.
The ES relay self-monitors to detect internal component failure and, in the unlikely event of an internal failure, flashes the Power LED.
Models are available in six standard input voltages.
Many ES relay models are self-powered, eliminating the need for additional power sources.
Conformal coating improves protection against dust and corrosion.
Accurate, repeatable, and reliable operation.

Manuals

Instruction Manual
- ES-25 Instructions, Rev H, English (649.5KB)
  Sync-Check Relay
- ES-25 Instructions, Rev H, Portuguese (800.6KB)
  Sync-Check Relay
- ES-27, ES-59, ES-27/59 Instructions, Rev J, English (1.1MB)
  AC Voltage Relay
- ES-27, ES-59, ES-27/59 Instructions, Rev J, Portuguese (1.2MB)
  AC Voltage Relay
- ES-32 Instructions, Rev H, English (613.7KB)
  Reverse Power Relay
- ES-32 Instructions, Rev H, Portuguese (630.1KB)
  Reverse Power Relay
- ES-37, ES-51, ES-37/51 Instructions, Rev G, English (982.4KB)
  AC Current Relay
- ES-37, ES-51, ES-37/51 Instructions, Rev G, Portuguese (1MB)
  AC Current Relay
- ES-47 Instructions, Rev G, English (646.9KB)
  Phase Sequence Relay
- ES-47 Instructions, Rev G, Portuguese (689.7KB)
  Phase Sequence Relay
- ES-47N, ES-47N/27 Instructions, Rev J, English (849.4KB)
  Phase Balance Relay
- ES-47N, ES-47N/27 Instructions, Rev J, Portuguese (934.9KB)
  Phase Balance Relay
- ES-49 Instructions, Rev G, English (935.1KB)
  Temperature Relay
- ES-49 Instructions, Rev G, Portuguese (956.5KB)
  Temperature Relay
- ES-55 Instructions, Rev D, English (582.4KB)
  Power Factor Relay
- ES-55 Instructions, Rev D, Portuguese (610.1KB)
  Power Factor Relay
- ES-74S Instructions, Rev J, English (1MB)
  DC Millivolt Sensing Relay
- ES-74S Instructions, Rev J, Portuguese (1.1MB)
  DC Millivolt Sensing Relay
- ES-74V Instructions, Rev G, English (779.8KB)
  DC Voltage Sensing Relay
- ES-74V Instructions, Rev G, Portuguese (974.9KB)
  DC Voltage Sensing Relay
- ES-81O, ES-81U, ES-81O/U Instructions, Rev G, English (876.7KB)
  Frequency Relay
- ES-81O, ES-81U, ES-81O/U Instructions, Rev G, Portuguese (929.3KB)
  Frequency Relay
- ES-25 Instructions, Rev H, Chinese (849.4KB)
  Sync-Check Relay
- ES-25 Instructions, Rev H, Spanish (694.5KB)
  Sync-Check Relay
- ES-27, ES-59, ES-27/59 Instructions, Rev J, Chinese (1.4MB)
  AC Voltage Relay
- ES-27, ES-59, ES-27/59 Instructions, Rev J, Spanish (1.2MB)
  AC Voltage Relay
- ES-32 Instructions, Rev H, Chinese (1MB)
  Reverse Power Relay
- ES-32 Instructions, Rev H, Spanish (623.4KB)
  Reverse Power Relay
- ES-37, ES-51, ES-37/51 Instructions, Rev G, Chinese (1.5MB)
  AC Current Relay
- ES-37, ES-51, ES-37/51 Instructions, Rev G, Spanish (1MB)
  AC Current Relay
- ES-47 Instructions, Rev G, Chinese (981.3KB)
  Phase Sequence Relay
- ES-47 Instructions, Rev G, Spanish (686.4KB)
  Phase Sequence Relay
- ES-47N, ES-47N/27 Instructions, Rev J, Chinese (1.3MB)
  Phase Balance Relay
- ES-47N, ES-47N/27 Instructions, Rev J, Spanish (919.6KB)
  Phase Balance Relay
- ES-49 Instructions, Rev G, Chinese (1.3MB)
  Temperature Relay
- ES-49 Instructions, Rev G, Spanish (996.2KB)
  Temperature Relay
- ES-55 Instructions, Rev D, Chinese (1014.1KB)
  Power Factor Relay
- ES-55 Instructions, Rev D, Spanish (656KB)
  Power Factor Relay
- ES-74S Instructions, Rev J, Chinese (1.4MB)
  DC Millivolt Sensing Relay
- ES-74S Instructions, Rev J, French (1.1MB)
  DC Millivolt Sensing Relay
- ES-74S Instructions, Rev J, Spanish (1.1MB)
  DC Millivolt Sensing Relay
- ES-74V Instructions, Rev G, Chinese (1.3MB)
  DC Voltage Sensing Relay
- ES-74V Instructions, Rev G, Spanish (840.5KB)
  DC Voltage Sensing Relay
- ES-81O, ES-81U, ES-81O/U Instructions, Rev G, Chinese (1.2MB)
  Frequency Relay
- ES-81O, ES-81U, ES-81O/U Instructions, Rev G, Spanish (925.9KB)
  Frequency Relay

Bulletins

Product Bulletin
- ES Series Bulletin, Rev 11, English (811.7KB)
  Protection Relays
- ES Series Bulletin, Rev 11, Portuguese (833.1KB)
  Protection Relays
- ES Series Bulletin, Rev 11, Chinese (1.1MB)
  Protection Relays
- ES Series Bulletin, Rev 11, Spanish (836.5KB)
  Protection Relays
Brochure
- Brochure: Power Systems Solutions - Proven Worldwide, English (5.9MB)
  Solutions for Excitation Systems, Protection Systems/Relays, Voltage Regulators, and Genset/Engine Controllers.
- Brochure: Power Systems Solutions - Proven Worldwide, Japanese (6.4MB)
  Solutions for Excitation Systems, Protection Systems/Relays, Voltage Regulators, and Genset/Engine Controllers.

Technical Resources

Agency Certification
- Agency Certification: UL Certificate of Compliance, ES Relays (53.1KB)
Application Guide
- Application Guide: Generator Protection (2.5MB)
  Simplify the process of selecting relays and relay systems to protect generators.
- Application Guide: Motor Protection (1.3MB)
  Overview of motor hazards and detection and protection options, plus typical setting-value range for BE1-11m.
- Application Guide: Transformer Protection (2.2MB)
  Simplify the process of selecting relays and relay systems to protect power transformers.
Conversion Chart
- Easy Conversion Chart: BE3-25 to ES-25 (PDF) (507.9KB)
  Style conversion chart makes it easy to determine the style you need.
- Easy Conversion Chart: BE3-25 to ES-25 (XLSX) (352.5KB)
  Style conversion chart makes it easy to determine the style you need.
- Easy Conversion Chart: BE3-27, 59, 27/59 to ES-27, 59, 27/59 (PDF) (673KB)
  Style conversion chart makes it easy to determine the style you need.
- Easy Conversion Chart: BE3-27, 59, 27/59 to ES-27, 59, 27/59 (XLSX) (656.1KB)
  Style conversion chart makes it easy to determine the style you need.
- Easy Conversion Chart: BE3-32 to ES-32 (PDF) (545.7KB)
  Style conversion chart makes it easy to determine the style you need.
- Easy Conversion Chart: BE3-32 to ES-32 (XLSX) (538.7KB)
  Style conversion chart makes it easy to determine the style you need.
- Easy Conversion Chart: BE3-37, 51, 37/51 to ES-37, 51, 37/51 (PDF) (704.4KB)
  Style conversion chart makes it easy to determine the style you need.
- Easy Conversion Chart: BE3-37, 51, 37/51 to ES-37, 51, 37/51 (XLSX) (532.3KB)
  Style conversion chart makes it easy to determine the style you need.
- Easy Conversion Chart: BE3-47 to ES-47 (PDF) (456.5KB)
  Style conversion chart makes it easy to determine the style you need.
- Easy Conversion Chart: BE3-47 to ES-47 (XLSX) (302.7KB)
  Style conversion chart makes it easy to determine the style you need.
- Easy Conversion Chart: BE3-47N, 47N/27 to ES-47N, 47N/27 (PDF) (501.9KB)
  Style conversion chart makes it easy to determine the style you need.
- Easy Conversion Chart: BE3-47N, 47N/27 to ES-47N, 47N/27 (XLSX) (344KB)
  Style conversion chart makes it easy to determine the style you need.
- Easy Conversion Chart: BE3-49R to ES-49 (PDF) (514.5KB)
  Style conversion chart makes it easy to determine the style you need.
- Easy Conversion Chart: BE3-49R to ES-49 (XLSX) (340.2KB)
  Style conversion chart makes it easy to determine the style you need.
- Easy Conversion Chart: BE3-74SH, 74SL, 74SD to ES-74S (PDF) (654.9KB)
  Style conversion chart makes it easy to determine the style you need.
- Easy Conversion Chart: BE3-74SH, 74SL, 74SD to ES-74S (XLSX) (531.9KB)
  Style conversion chart makes it easy to determine the style you need.
- Easy Conversion Chart: BE3-74VH, 74VL, 74VD to ES-74V (PDF) (566.6KB)
  Style conversion chart makes it easy to determine the style you need.
- Easy Conversion Chart: BE3-74VH, 74VL, 74VD to ES-74V (XLSX) (452.2KB)
  Style conversion chart makes it easy to determine the style you need.
- Easy Conversion Chart: BE3-81O, 81U, 81O/U to ES-81O, 81U, 81O/U (PDF) (657.2KB)
  Style conversion chart makes it easy to determine the style you need.
- Easy Conversion Chart: BE3-81O, 81U, 81O/U to ES-81O, 81U, 81O/U (XLSX) (532KB)
  Style conversion chart makes it easy to determine the style you need.
Technical Paper
- Technical Paper: Intertie Requirements for DGs Connected to Radial-Distribution Feeders (537.3KB)
  Proposed protection requirements for distributed generation connected to radial-distribution feeders.
- Technical Paper: Introduction to Synchronizing (181.5KB)
  Automatic synchronizing process and a guide for selection of the proper synchronizer.
- Technical Paper: Load Shedding for Utility and Industrial Power System Reliability (972.9KB)
  Analysis of the conditions in which load shedding may be needed and review of load shed implementation strategies.
- Technical Paper: Protective Relaying Issues in Low-Voltage Systems as Addressed in the National Electric Code (1.6MB)
  Low Voltage (LV) design practices, as mentioned in the National Electric Code (NEC).
- Technical Paper: Who has the 32? (2.8MB)
  Understanding Directional Power (ANSI device number 32) protection.

Applications

Application Guide
- Application Guide: Generator Protection (2.5MB)
  Simplify the process of selecting relays and relay systems to protect generators.
- Application Guide: Motor Protection (1.3MB)
  Overview of motor hazards and detection and protection options, plus typical setting-value range for BE1-11m.
- Application Guide: Transformer Protection (2.2MB)
  Simplify the process of selecting relays and relay systems to protect power transformers.
Application Note
- Application Note: PC-ES25 (392.5KB)
  Enhanced Sync-Check Operation Using the Basler ES-25 Relay.
- Application Note: PC-ES32 (538.6KB)
  Basler ES-32 Reverse Power Relay improves performance by measuring real power.
- Application Note: PC-ES47 (445KB)
  Operating Principles of Basler ES-47 Phase Sequence Relay.
- Application Note: PC-ES55 (541.5KB)
  ES-55 Power Factor Relay Applications
- Application Note: PC-FLEX-GENPROT (602.6KB)
  Generator Reverse Power Protection (32) replacement opportunities.