Quick Sizing & Sourcing Snapshot

• Manufacturer:​ GE Multilin (General Electric / Emerson)
• Part Number:​ UR6PH
• System Platform:​ UR Series Universal Relays (G60, T60, D60, F60, M60, etc.)
• Hardware Type:​ Digital I/O Expansion Module (Compact)
• Architectural Role:​ Plugs into a UR relay chassis (Slot 3-6) to provide 4 isolated digital inputs and 6 Form-A (SPST) relay outputs with optional current metering, offloading auxiliary logic from the CPU.
• Key Specifications:​ 6 Form-A Relays​ (5A @ 30V DC / 250V AC), 4 Opto-Isolated Inputs​ (24-250V DC Config), Hot-Swappable.

 

System Architecture & Operational Principle

The sits in the Purdue Level 1​ hardware stack, occupying a standard slot (usually Slot 3 through 6) in a UR series chassis (e.g., UR6CH or UR10CH). It connects to the main CPU (like a UR9GH) via the UR Backplane Bus, a high-speed proprietary link synchronizing I/O state with the relay’s FlexLogic engine.

Physically, it’s a single-slot module with a removable terminal block. Upstream, it receives commands from the CPU: “Close Aux Relay 1” or “Read Status of CB Spring Charge.” Downstream, it drives real-world hardware. The 6 Form-A (SPST) relays​ are the workhorses here—typically used for Trip Circuit Supervision​ (TCS), closing tallies, or driving auxiliary relays for cooling fans and alarm annunciators. The 4 Digital Inputs​ are optically isolated (2500Vrms), accepting dry contacts or wet voltages (24V to 250V DC, software selectable ranges).

A key differentiator for the “PH” variant is the Current Metering​ capability on the outputs. Unlike a dumb relay card, this module can measure the actual milliamps​ flowing through the relay contacts (e.g., through a breaker trip coil). This lets the UR relay detect “Trip Coil Open” or “Stuck Trip” conditions via FlexLogic​ rather than just relying on auxiliary contacts. It processes contact debounce locally (1ms to 60s programmable) so the CPU isn’t interrupted by switch bounce.

 

Core Technical Specifications

• Output Channels:​ 6x Form-A (SPST), Electromechanical Relays
• Output Rating:​ 5A Resistive​ @ 30V DC / 250V AC (Derating required for inductive loads)
• Input Channels:​ 4x Optically Isolated​ (Dry Contact or Wet: 24/48/125/250V DC)
• Metering:​ Current Sense​ on Outputs (Detects 0-250mA loop current)
• Isolation:​ 2500V RMS​ (Field to Backplane/Logic)
• Response Time:​ < 8ms (Input to Backplane), < 10ms (Command to Output Close)
• Power Source:​ Backplane Powered (Via UR Chassis/Power Supply)
• Config:​ Software Selectable​ Input Ranges (No DIPs for voltage, only ID DIPs)
• Environmental:​ -40°C to +70°C​ (Operational)
• Hot-Swap:​ Yes​ (Module can be replaced live if chassis power maintained)

 

Customer Value & Operational Benefits

Trip Circuit Supervision (TCS) without Extra Hardware

The built-in current metering​ is the killer feature here. Old-school schemes needed separate DC transducers or shunts to check if a breaker trip coil was healthy. With the , you map the coil circuit through Output 1, and the UR CPU reads the milliamps via FlexLogic. If current is 0mA during a test pulse, it alarms “Trip Circuit Open” before you try to clear a fault and fail. This catches maintenance issues days earlier​ using existing wiring.

Dense Auxiliary Control in One Slot

You get 6 Relays + 4 Inputs​ in a single vertical inch of rack space. In retrofits where you’re squeezing a G60 into a vintage 19″ bay, you don’t want to burn two slots for I/O. The handles the “miscellaneous” stuff—fan start, local alarms, lockout relay resets—freeing up the CPU and other slots for critical protection I/O (CTs/VTs).

Noise Immunity in Switchyards

Those 4 inputs are optically isolated​ with software-selectable thresholds. Unlike sinking/sourcing PLC inputs that hate long cable runs in substations, these shrug off induced voltage from switching transients. You can run 250V DC bell wire from a disconnect switch 500 yards away; the reads it cleanly without the “flickering status”​ headaches common in older solid-state inputs.

 

Field Engineer’s Notes (From the Trenches)

The “Gotcha” with is Inductive Load Suppression.

Those 6 Form-A relays are rated 5A, but that’s for resistiveloads. If you’re switching a 125V DC Solenoid​ (Cooling Fan Starter Coil) or a Trip Coil, the collapse voltage will pit the contacts rapidly.

Rule:​ Add Flyback Diodes​ (for DC) or RC Snubbers​ (for AC) across the load, not the relay terminals. If you skip this, the will work for 6 months, then you’ll get “Intermittent Aux Failure” alarms as the contacts weld or oxidize.

DIP Switch Sanity:​ The small DIP bank (SW1) on the board edge is only for Module ID​ (Address 0-7). It does notset input voltage ranges anymore—that’s all in EnerVista​ under “Hardware Config -> I/O Card Setup.” I’ve seen guys waste an hour toggling DIPs because the inputs won’t read 125V, only to find the software was set to “24V Range.”

Current Metering Calibration:​ If using the mA readback, remember the lead resistance matters. A long run of #14 wire to a trip coil adds Ohms. Use the “Lead Resistance Compensation”​ setting in the UR setup. If you don’t, a healthy 2A trip current might read as 1.8A, and your “Low Current” alarm will nuisance trip during a winter cold start.

 

Real-World Applications

• G60 Generator Protection (Combined Cycle):​ in Slot 4 drives the 52A/52B Aux Relays​ for the Generator Breaker. Output 1 monitors Trip Coil A current (Metering); Output 2 monitors Trip Coil B. Input 1 reads “Fire Protection Trip” (125V DC Dry Contact). This consolidates 3 old panels into one UR slot.
• M60 Motor Protection (Water Treatment):​ Mounted in a remote UR6CH chassis in a pump house. The 4 inputs read “Valve Open/Limit” (24V DC) from the intake gates. The 6 Form-A relays stage the Oil Cooler Fans​ and trigger the “High Vibration” local horn. The current metering on the Fan relay confirms the starter coil actually pulled in, catching a bad contactor before the motor overheats.

 

High-Frequency Troubleshooting FAQ

A: Check the Physical DIP Switches (SW1)​ on the new module’s top edge. They set the Slot ID (0-7). If the old module was set to Address “3” (Slot 4) and you left the new one at “0”, the CPU expects a different serial number/ID at that slot. Set the DIPs to match the physical slot positionas defined in your EnerVista hardware config, download the setup again, and cycle power to the chassis.

Q: Output relay clicks (LED flashes), but the field device (solenoid/fan) doesn’t energize?

A: You’re likely missing the External Supply. The relays are Dry Contacts​ (Switches); they do notsupply the voltage to run the motor/fan. You must land your 125V DC (or 24V/120V AC) Common​ onto the COM​ terminal of the block, and run the Load Return​ from NO​ (Normally Open) to the device. If you only run the wire from the device to the and leave “COM” floating, the relay will click open/closed doing absolutely nothing.

Q: Digital Inputs show “TRUE” (Active) in the UR logic, but the field contact is definitely Open (0V)?

A: Check your Voltage Range Selection​ in EnerVista (Setup -> Hardware -> -> Input Configuration). If the input is wired to a 125V DC battery, but the software is set to “24V Range,” the threshold is too low, and inductive coupling from nearby CT wires might be tricking the opto-isolator into seeing a “fake” voltage. Set the range to match the field voltage (e.g., “125V DC”), and enable the Input Filter​ (Debounce) to 20-50ms to kill noise.

Please note:​ The listed price is not the actual final price. It is for reference only and is subject to appropriate negotiation based on current market conditions, quantity, and availability.