| SEL-3530 3U/1U | SEL-3530-4 | SEL-3505 | SEL-3505-3 | SEL-2240 Axion With SEL-2241 Module | SEL-3555 RTAC | |
| Processor | 533 MHz | 533 MHz | 333 MHz | 333 MHz | 533 MHz | 2.5 GHz Intel i7 dual-core 2.1 GHz Intel i7 quad-core |
| RAM | 1 GB | 1 GB | 512 MB | 512 MB | 1 GB | 8 GB |
| Storage | 2 GB | 2 GB | 2 GB | 2 GB | 2 GB | 30 to 250 GB |
| Operation Temperature Range | –40° to +85°C | –40° to +85°C | –40° to +85°C | –40° to +85°C | –40° to +85°C | –40° to +75°C (dual-core); –40° to +60°C (quad-core) |
| Video Port | None | None | None | None | None | Integrated video; 1 DisplayPort; 1 DVI/VGA port; 1 DVI-D port |
| Power Supply | Single: 120/240 Vac, 125/250 Vdc; 48/125 Vdc, 120 Vac; or 24/48 Vdc | Single: 120/240 Vac, 125/250 Vdc; 48/125 Vdc, 120 Vac; or 24/48 Vdc | Single: 12/24 Vdc or 24/48 Vdc | Single: 12/24 Vdc or 24/48 Vdc | Redundant: 120/240 Vac, 125/250 Vdc; and/or 24/48 Vdc | Redundant: 120/240 Vac and/or 125/250 Vdc |
| Ethernet Ports | 3 | 2 | 2 | 2 | 2 | 2 standard, 4 per PCI card (up to 2 cards supported) |
| Serial Ports | 17 (standard)/33 (3U) | 4 | 4 | 3 | 4 | 8 standard, 6 per PCI card (up to 3 additional cards supported) |
| USB Ports | USB-B | USB-B | USB-B | USB-B | USB-B | 6 USB-A |
| Size/Mounting | 3U or 1U rack/panel mount | 1U half-rack/panel, surface, or DIN-rail mount | Surface or DIN-rail mount | Surface or DIN-rail mount | 5U rack/panel or surface mount (10-slot, 4-slot, and dual 4-slot) | 3U |
| Digital and Analog Input/Outputs | 1 digital output/1 digital input (standard); 8 digital outputs/24 digital inputs (3U) | 1 digital output/1 digital input | 1 digital output/1 digital input | 3 digital outputs/8 digital inputs | Available modules:
| None |
| Other Features | Conformal coating | Conformal coating | Conformal coating, V.92 modem, ambient light sensor, and accelerometer | Conformal coating, ambient light sensor, and accelerometer | Conformal coating | Conformal coating |
Protocols
The following protocols are offered as standard options on all the RTACs.
CLIENT
*Only available on the SEL-3555
SERVER
*Only available on the SEL-3555
PEER TO PEER
Options
| SEL-3530 3U/1U | SEL-3530-4 | SEL-3505 | SEL-3505-3 | SEL-2240 Axion With SEL-2241 Module | SEL-3555 RTAC | |
| IEC 61850 Options | ||||||
| IEC 61850 MMS and MMS Client File Services | ||||||
| IEC 61850 MMS and MMS Server File Services | ||||||
| IEC 61850 GOOSE | ||||||
| Fieldbus | ||||||
| EtherCAT to SEL Axion I/O Modules | ||||||
| HMI | ||||||
| Graphical Web-Based Viewing and Control | ||||||