Purchase now: Phoenix Contact 1291176 Ex-i Solenoid Driver
Atlantech Drives provides you the Phoenix Contact 1291176 (Type: MACX MCR-EX-AP-2SD-25-35-LP), a high-performance Solenoid Driver designed to safely actuate control valves, alarm transmitters, and other discrete devices located in hazardous explosive areas. This 2-channel device acts as an intrinsically safe interface, limiting the energy delivered to the field to prevent spark ignition, while receiving control commands from a PLC in the safe area.
Key Technical Features and Loop-Powered Design
The 1291176 is distinguished by its Loop-Powered architecture, meaning it does not require a separate 24V DC power supply; it draws its energy directly from the control signal loop. This simplifies cabinet wiring and reduces the thermal load. It features standard Screw Connections, preferred in applications where heavy-gauge wiring or extreme vibration might require high-torque termination.
- Model: MACX MCR-EX-AP-2SD-25-35-LP.
- Channels: 2 Independent Channels.
- Safety Integrity Level: SIL 3 (IEC 61508) – One of the highest safety ratings.
- Output Characteristic: Intrinsically Safe (Ex i).
- Output Voltage: > 9.5 V DC at 35 mA (per channel).
- Connection: Screw Terminal Blocks.
- Isolation: 4-way electrical isolation.
- Housing: Compact 12.5 mm DIN rail mount.
Installation Advice: Calculating Cable Resistance
When driving solenoids in hazardous areas over long distances, voltage drop is critical. The 1291176 provides a specific output curve. Expert Advice: Always calculate the total loop resistance (Cable Resistance + Solenoid Coil Resistance). Ensure that at the maximum current (e.g., 35mA), the voltage remaining at the solenoid terminals is above its minimum pull-in voltage (usually 18V-20V for standard valves, but Ex valves may differ).
Frequently Asked Questions (FAQs)
Q: What is the difference between this unit and the «LP-SP» version?
A: The 1291176 uses standard Screw Terminals, whereas the 1291186 uses Push-in terminals. Internally, the electronics and specs are identical.
Q: Can I combine the two channels for higher current?
A: Yes, the two channels can be connected in parallel to drive a single high-current load (up to 70 mA), but you must verify the Ex entity parameters for the combined output.
Do you need more references from this brand? Explore our full catalog of Phoenix Contact here.
