Schweitzer Engineering Laboratory

Motor Management Relay includes arc-flash light sensor.
Electrical Equipment & Systems

Motor Management Relay includes arc-flash light sensor.

Using standard motor thermal management, overcurrent protection, and integrated arc-flash detection, Model SEL-849 protects equipment and personnel in low- and medium-voltage motor control centers. Unit features 4 contact outputs,Â- 6 opto-isolated control inputs, EIA-232/EIA-485 port, and Ethernet 10/100 BASE-T port. With 2.8 x 5 x 6 in. form factor andÂ- current input of 0.5–128 A,...

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Generator Relay protects against abnormal conditions.
Electrical Equipment & Systems

Generator Relay protects against abnormal conditions.

SEL-547 Distributed Generator Interconnection Relay provides utility-grade protection when using generator in all operating modes including peak shaving, base loading, islanding, and emergency backup. Relay provides most basic generator protection functions recommended by IEEE Standard P1547 including over/under voltage detection for single or 3-phase, over/under frequency detection, synchronism...

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Protection Relay monitors 2-winding transformers.
Electrical Equipment & Systems

Protection Relay monitors 2-winding transformers.

SEL-387A monitors and protects transformers and other 2-port electrical apparatus. Protection includes differential and overcurrent protection for 3-phase current inputs, and optional Restricted Earth Fault function. Four serial communications ports enable remote metering and control of system functions and settings via PC. Sequential-events recorder logs all changes of state within relay logic...

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Motor Management Relay includes arc-flash light sensor.
Electrical Equipment & Systems

Motor Management Relay includes arc-flash light sensor.

Using standard motor thermal management, overcurrent protection, and integrated arc-flash detection, Model SEL-849 protects equipment and personnel in low- and medium-voltage motor control centers. Unit features 4 contact outputs,Â- 6 opto-isolated control inputs, EIA-232/EIA-485 port, and Ethernet 10/100 BASE-T port. With 2.8 x 5 x 6 in. form factor andÂ- current input of 0.5–128 A,...

Read More »
Generator Relay protects against abnormal conditions.
Electrical Equipment & Systems

Generator Relay protects against abnormal conditions.

SEL-547 Distributed Generator Interconnection Relay provides utility-grade protection when using generator in all operating modes including peak shaving, base loading, islanding, and emergency backup. Relay provides most basic generator protection functions recommended by IEEE Standard P1547 including over/under voltage detection for single or 3-phase, over/under frequency detection, synchronism...

Read More »
Protection Relay monitors 2-winding transformers.
Electrical Equipment & Systems

Protection Relay monitors 2-winding transformers.

SEL-387A monitors and protects transformers and other 2-port electrical apparatus. Protection includes differential and overcurrent protection for 3-phase current inputs, and optional Restricted Earth Fault function. Four serial communications ports enable remote metering and control of system functions and settings via PC. Sequential-events recorder logs all changes of state within relay logic...

Read More »

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