--- type: product schema_version: 1 stock_number: "90989-1" canonical_url: "https://www.artisantg.com/TestMeasurement/90989-1/SEL-SEL-421-Protection-Automation-Control-Module" json_url: "https://www.artisantg.com/TestMeasurement/90989-1/SEL-SEL-421-Protection-Automation-Control-Module.json" generated_at: "2026-11-07T20:01:48.855Z" last_updated: "2026-07-30T09:10:57.047-05:00" --- # SEL SEL-421 Protection Automation Control Module _Summary and Categories are this item's record. The description sections and FAQ are machine-assisted and can contain errors; where they disagree with the record, the record is correct, and where description sections disagree with each other, Details wins._ ## Summary - Manufacturer: SEL - Model: SEL-421 - Condition: Used and in Excellent Condition - Price: $4,250.00 USD - Availability: In stock, 15 available - Warranty: 1-Year Warranty with 30-Day Return Guarantee - ITAR restricted: No - Shipping weight: 30 lb - Shipping dimensions: 32X24X24 in ## Categories - Industrial Systems Equipment > PLCs and Controllers > Controllers (primary) - Industrial Systems Equipment > Miscellaneous > Operator Interfaces ## Details ### 042126152B4B4H26XXXXX Configuration - Firmware: Standard - Power Supply: 125/250 VDC or 120/240 VAC - Connector Type: Screw Terminal Block - Secondary Inputs: 300V Phase - Neutral Maximum (Wye), 5 Amp Phase - Serial Communications Protocols: DNP3 Level 2 Slave Plus Dial-Out and Virtual Terminal - Ethernet Communications Protocols: FTP, Telnet, Synchrophasors, and DNP3 LAN/WAN - Ethernet Connection Options: Ethernet Card with One 10/100BASE-T, One 100BASE-FX Connector - Mainboard I/O Configuration: Standard w/ 3 High-Current Interrupting Outputs, 2 Standard Form A Outputs, 3 Standard Form C Outputs, and 7 Optoisolated Level-Sensitive Inputs - Mainboard Input Voltage: 125 VDC - Mounting: Horizontal Rack Mount - Chassis: 4U, Up to One Additional I/O Board - I/O Board Position B for 4U or 5U Chassis: 8 Independent Inputs, 13 High-Current Interrupting Form A, 2 Standard Form C Outputs - I/O Board Position B Input Voltage: User-Selectable Pickup Voltage Level (Available Only on I/O Board Options 1, 5, and 6) - Conformal Coat: None 042126152B4B4H26XXXXX Configuration (pdf) Part Number: 042126152B4B4H26XXXXX ## Images - - - -