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Mount the SEL-751A in a sheltered indoor environment (a building or an enclosed cabinet) that does not exceed the 
temperature rating of –40°C to +85°C. For mounting consideration, the relay dimensions are shown below.

                     

New Control Center

Retrofitting

                     

                     

                      

                     

                      

1. Place the enclosed Panel 

Cutout over desired 
mounting location and 
trace.

2. Make smooth cut around 

cutout.

3. Place mounting gasket 

around relay and insert 
unit into hole. (The 
photo displays optional 
appearance bezel.)

4. Fasten relay to mounting 

plate with included screws.

                     

                      

                     

                      

1. Remove old relay.

2. Insert retrofitting plate and 

fasten (see www.selinc.com/
sel-751a.htm for retrofits).

3. Place mounting gasket 

around relay and insert 
unit into retrofitting plate.

4. Fasten relay to mounting 

plate with included screws.

Rack Mounting

Courtesy of NationalSwitchgear.com

Summary of Contents for SEL-751A

Page 1: ...et Serial Port Cover Configurable Label Kit if equipped Label Removal Tool Blank Pushbutton LED Label 198 0424 RIGHT UP Blank Target LED Label 198 0424 LEFT UP For Additional Technical Assistance Call...

Page 2: ...ONTROL INPUTS INPUT POWER OUTPUT CONTACTS SEL 751A Feeder Protection Relay A diagram for a four wire wye connection is also available in the instruction manual Power Supply 110 230 Vac 24 48 Vdc 110 2...

Page 3: ...g location and trace 2 Make smooth cut around cutout 3 Place mounting gasket around relay and insert unit into hole The photo displays optional appearance bezel 4 Fasten relay to mounting plate with i...

Page 4: ...p 3 Connect up to 2 digital inputs per application requirements to optoisolated inputs IN101 terminals 10 and 11 and IN102 terminals 11 and 12 Step 4 Connect the 3 output contacts per application requ...

Page 5: ...agram For other PT connection options refer to Section 2 of the SEL 751A manual Card Slot Z Current Inputs Card Connect phase current and neutral current inputs as shown in the typical connections dia...

Page 6: ...your choice for the connection Then you will choose which port to connect through Make sure you select the same port that you connected the cable to then click OK Step 4 Set the PC terminal emulation...

Page 7: ...LERATOR QuickSet SEL 5030 Software a Connect the relay to a PC using an SEL C234A serial or SEL C662 USB cable b Apply power to the relay c Start the ACSELERATOR QuickSet software program and establis...

Page 8: ...tering Group 1 Logic Settings Enable and enter SELOGIC equations settings as needed by the application Repeat above steps for Group 2 and 3 settings if required by the application Global Settings Revi...

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