Description
- Model: G468-0001 (Ultra SlimPak)
- Brand: Action Instruments (Eurotherm / Barber-Colman)
- Series: Ultra SlimPak G-Series
- Core Function: DC Input, Dual Limit Alarm with Isolated Signal Conditioning
- Product Type: DIN Rail Mount Limit Alarm / Isolator
- Key Specs: 1800 V DC Isolation, Dual SPDT Relays, Wide-ranging DC input
- Input Range: User-configurable from 10 mV to 100 V DC or 0 mA to 100 mA DC
- Output Type: Dual SPDT (Form C) Relays
- Contact Rating: 2 A @ 120 V AC or 28 V DC (Resistive)
- Isolation: 1800 V DC between Input, Output, and Power
- Power Requirement: 9 V to 30 V DC (Typical 24 V DC)
- Accuracy: ±0.1% of span
- Response Time: <100 ms (Typical)
- Mounting: Standard 35 mm DIN Rail
- Housing Width: 12.5 mm (Ultra Slim footprint)
- Operating Temp: 0 to 60 °C (32 to 140 °F)
Ultra Slimpak G468-0001
Application Scenarios & Pain Points
The Action Instruments G468-0001 is a specialized tool used when you need to “split” an analog signal into two distinct alarm thresholds while keeping the circuit isolated from high-voltage transients. Its primary appeal is the 12.5 mm width—it saves massive amounts of rail space in crowded control cabinets. However, because Action Instruments has been absorbed into the Eurotherm/Schneider ecosystem, these specific G468 units can be hard to source quickly during a plant breakdown.
Typical Application Scenarios:
- Tank Level Alarms Monitoring a 4-20 mA level sensor and triggering “High” and “High-High” alarm relays for pump shut-off.
- Battery Monitoring Systems Isolating and monitoring 48 V DC battery banks to trigger an alarm if voltage drops below a critical threshold.
- Safety Interlocks Providing a hardware-based alarm backup for PLC systems in critical temperature or pressure loops.
- Signal Splitting & Isolation Protecting sensitive PLC inputs from ground loops or high-voltage spikes in outdoor field wiring.
The “Dead Relay” Trap: I’ve seen many technicians replace a G468-0001 only to find the new one “doesn’t work.” Usually, the issue isn’t the module—it’s the contact rating. If you try to drive a large motor starter directly with these 2 A relays without an interposing relay, the contacts will weld shut in a week. Always check your load; if it’s more than a small pilot light or a PLC input, use an external relay.
Compatible Replacement Models
The G468 series is highly configurable, but the “-0001” suffix denotes the standard high-performance version.
| Original Model | Replacement Model | Compatibility | Main Difference | Impact |
| G468-0001 | G468-0000 | ⚠️ Hardware Compatible | Different factory defaults | Requires manual DIP switch setup |
| G468-0001 | WV468-2000 | ⚠️ Software Compatible | Newer “Wave” series | Different physical dimensions |
| G468-0001 | G448-0001 | ❌ Incompatible | Single alarm only | Loses one relay output |
Engineering Note: Calibration of the G468-0001 is done via the top-mounted potentiometers (Set 1 and Set 2). It’s a bit “old school” compared to modern USB-programmable modules, but it’s far more reliable in high-heat environments where digital chips often fail.
Ultra Slimpak G468-0001
Troubleshooting Quick Reference
| Symptom | Possible Cause | Relation to This Board | Quick Check | Action |
| PWR LED is Off | Power Supply Fail | ❌ Low | Measure 24 V DC at pins 1 & 3 | Check cabinet power supply |
| Relay Chattering | Narrow Deadband | ✅ High | Check S1/S2 switch settings | Increase deadband/hysteresis |
| Output Constant Fault | Blown Input Circuit | ✅ High | Inject 1 V signal at input pins | If no relay response, replace unit |
| Inaccurate Triggering | Drift / Pot Wear | ✅ High | Verify input with Fluke 789 | Re-calibrate Setpoint Pots |
Our 4-Step Quality Assurance Process:
- Physical Integrity: We check the side-label DIP switches for any physical damage or “sticky” switches.
- Isolation Test: We perform a 1500 V DC dielectric strength test to ensure the isolation barrier is intact.
- Signal Calibration: Using a Fluke 754, we sweep the input from 0 to 100% and verify both Relay 1 and Relay 2 trip at the exact setpoints.
- Relay Continuity: We check the “NC/NO” contact resistance to ensure the internal relays have <0.5 ohms of resistance when closed.
For a technical quote or a DIP switch chart: Visit www.newplcdcs.com
Other Signal Conditioning Inventory:
- Action Instruments G168-0000
- Action Instruments G408-0001
- Moore Industries ECT/4-20MA
- Phoenix Contact MCR-C-UI-UI-DCI
- Pepperl+Fuchs KFD2-STC4-EX1
- MTL 5541 (Repeater Power Supply)
- Turck IM1-22EX-R
- Weidmuller WAS5 VCC HF
