The Contemporary Controls EISK5-100T Skorpion Switch is a 5-port unmanaged Ethernet switch built for cost-conscious control panel installations. It delivers 10/100 Mbps non-blocking performance on every port with full plug-and-play operation, no IP address, no web interface, and no firmware setup. A half-wave rectified low-voltage power supply accepts 10-36 VDC or 24 VAC, allowing the switch to share a common 24VAC control bus with actuators, sensors, and other field devices. At only 26 mm (1 inch) wide, it fits where DIN-rail space is at a premium, and a writable side label lets the installer document each cable run right on the unit.
Plug-and-Play Operation
- ›Auto-negotiation of speed (10/100) and duplex (half/full)
- ›Auto-MDIX accepts straight-through or crossover cables
- ›Store-and-forward switching, non-blocking wire-speed
- ›ANSI/IEEE 802.3 compliant
Flexible Power & Bus Sharing
- ›Wide-range input: 10-36 VDC or 24 VAC ±10%
- ›Half-wave rectified PSU shares 24VAC control bus
- ›Redundant power: DC + DC, DC + AC, or AC + DC
- ›Reverse-polarity protection on inputs
Compact Industrial Build
- ›Only 26 mm (1 inch) wide on the DIN-rail
- ›Rugged aluminium enclosure with metal DIN clip
- ›Writable side label for cable documentation
- ›IP30 protection, RoHS compliant
Diagnostic LEDs & Connectors
- ›Power LED (green) for supply status
- ›Per-port "L" LED: green=100 Mbps, yellow=10 Mbps, flashing=data
- ›Per-port "D" LED: green=full duplex, off=half duplex
- ›Shielded RJ-45 connectors on all 5 ports
- ›Removable 4-pin power connector for fast servicing
| Specifications | |
|---|---|
| Ports | 5 × 10BASE-T/100BASE-TX, shielded RJ-45, Auto-MDIX |
| Data Rate | 10/100 Mbps, auto-negotiated |
| Switching Mode | Store-and-forward, non-blocking (full wire-speed) |
| IEEE Standard | ANSI/IEEE 802.3 |
| Power Input | 10-36 VDC (3 W) or 24 VAC ±10%, 47-63 Hz (6 VA) |
| Power Supply Type | Half-wave rectified, allows sharing of 24VAC/VDC control bus |
| Power Redundancy | Backup input supports DC or AC; reverse-polarity protected |
| Power Connector | 4-pin removable terminal block (COM / HI / HIB / chassis) |
| Operating Temperature | 0°C to +60°C (+32°F to +140°F) |
| Storage Temperature | -40°C to +85°C |
| Humidity | 10-95%, non-condensing |
| Protection Rating | IP30 |
| Mounting | TS-35 DIN-rail |
| Dimensions (W × D × H) | 26 × 70 × 100 mm (1.0 × 2.74 × 3.94 in) |
| Shipping Weight | 1 lb (0.45 kg) |
| Enclosure | Rugged aluminium, with integrated metal DIN-rail clip |
| Wire Size (Power) | 16-22 AWG solid, 16-18 AWG stranded |
| Regulatory | UL 508 Listed (Industrial Control Equipment), c-UL Listed, CE Mark, FCC Part 15 Class A, RoHS |
| UL 508A Compatibility | Directly acceptable as UL 508 Listed Industrial Control Equipment in UL 508A panels |
| Warranty | 5-year limited (Contemporary Controls) |
Frequently Asked Questions
Can the EISK5-100T be installed in a UL 508A control panel?
Yes. The EISK5-100T is UL 508 Listed and c-UL Listed for Industrial Control Equipment. UL 508-listed components are directly acceptable for use in UL 508A panels without invalidating the panel listing, as long as the device is supplied from a Class 2 limited-energy source per the panel's circuit requirements.
Can I power the switch from my existing 24VAC control bus?
Yes. The EISK5-100T uses a half-wave rectified low-voltage power supply, which means it can share a common 24VAC source with other control devices such as actuators, valves, sensors, and thermostats. This is a notable advantage in BAS panel design where a single 24VAC class 2 transformer often feeds the entire field-device bus.
How does redundant powering work on the EISK5-100T?
The 4-pin connector accepts a primary input (HI) and a backup input (HIB), both referenced to common (COM). The backup can be either DC or AC, giving flexibility for site conditions: DC primary with DC backup, DC primary with AC backup, or AC primary with DC backup. If the primary fails, the switch keeps running on the backup. Note that there is no fault relay output on this model.
Does the switch require any configuration?
No. The EISK5-100T is fully unmanaged and plug-and-play. It has no IP address, no web interface, and no firmware to set up. Each port auto-negotiates speed (10/100) and duplex (half/full), and Auto-MDIX accepts either straight-through or crossover cables.
What do the L and D LEDs on each port indicate?
Every port has two LEDs. The "L" (link/rate) LED glows green for an established 100 Mbps link, yellow for 10 Mbps, and flashes when data is being transmitted or received. The "D" (duplex) LED glows green when the link is in full-duplex mode and is off in half-duplex mode (where it will flash briefly if a collision occurs). Together they give immediate per-port visibility into link state, speed, and duplex without needing a managed switch.
Is the EISK5-100T suitable for outdoor installations?
No. The EISK5-100T has an indoor operating range of 0°C to +60°C and is not rated for outdoor or extreme-temperature applications. For outdoor enclosures or wide-temperature requirements, see the EISW5-100T or EISW8-100T, which are rated -40°C to +75°C.
How is this switch different from the EISW8-100T?
The Skorpion EISK5-100T is a compact, cost-effective indoor switch with 5 ports, UL 508 ICE listing, and indoor 0-60°C operating range. The EISW8-100T is a newer industrial switch with 8 ports, wide -40 to +75°C operating range, UL 62368-1 ITE listing, a fault relay output for power monitoring, and dual isolated DC redundancy. Choose EISK5 for cost-sensitive standard control panels; choose EISW for outdoor enclosures, demanding environments, or builds that need power-loss alarming.
- Sub-Category:
- Unmanaged Switches
