LDP1WC/250P-16 – DIN‑rail Surge Protection Module for 250 VAC Control & Power Lines

The model LDP1WC/250P-16 appears to be a compact, single-channel surge protective device (SPD) for 250 VAC circuits, typically used to shield PLCs, HMIs, drives, and low‑voltage power supplies in control cabinets. From my experience, the “P” often denotes a pluggable protection cartridge, while “WC” tends to indicate a version with a warning/remote contact. If you’re standardizing cabinet protection across machines, this kind of module keeps wiring short and tidy, which is exactly what IEC/EN 61643-11 recommends for dependable surge performance.

Company’s Order Placement Process and Guarantees

• Warranty: 365 days
• Delivery: 1 week if in stock; no more than one month at the latest
• Payment: 50% advance payment; full payment prior to delivery
• Express Options: FedEx, UPS, DHL

Key Features

• Type 2 AC surge protection – Designed for 250 VAC panels to help protect sensitive control electronics against switching surges and nearby lightning events.
• DIN‑rail, narrow footprint – Fits standard 35 mm rail in crowded cabinets; you might notice it frees up space compared with bulkier legacy protectors.
• Pluggable protection module (typical) – The “P” variant is commonly pluggable, so maintenance teams can swap cartridges in minutes without disturbing the base wiring.
• Remote alarm contact (“WC” variants) – Usually provides a dry contact you can wire to a PLC input for proactive maintenance alerts.
• Visual status indicator – A quick glance shows protection status; in many cases, green is OK and red flags a spent module.
• Short-lead, low-impedance design – Encourages proper bonding to PE and short routing to maximize let-through performance.

Technical Specifications

Application Fields

This model is commonly deployed in:

• PLC and HMI panels in factory automation lines
• Machine tools, packaging equipment, conveyors, and robotic cells
• VFD/soft‑starter incomers and auxiliary 24 VDC supply primaries
• Building automation cabinets (BMS), access control, and security systems
• Water/wastewater plant MCC rooms and remote pump stations
• HVAC control panels and chiller plants

A maintenance supervisor at a food plant told us they added these on feeder circuits to the PLC racks; nuisance faults during storms dropped to almost zero. That’s pretty typical when the bonding is done right and lead lengths are kept short.

Advantages & Value

• Reliability – Type 2 surge protection is a practical middle ground for most cabinets; it seems to handle day‑to‑day transients well without overcomplicating the design.
• Compatibility – Works with single‑phase 250 VAC circuits that feed PLCs, HMIs, network switches, and 24 VDC power supplies.
• Lower total cost – Pluggable cartridges (where applicable) cut downtime and reduce technician hours compared to rewiring a fixed SPD block.
• Remote monitoring – The “WC” style contact is easy to land on a spare DI for predictive maintenance and alarm history.
• Panel-friendly – Slim profile helps when you’re tight on rail space; standard 35 mm DIN rail simplifies stocking and replacement.

Installation & Maintenance

• Environment – Install inside an IP‑rated enclosure; allow basic ventilation and keep away from sustained heat sources.
• Wiring – Keep conductors short and straight to L/N and the PE busbar; avoid loops. Use the recommended torque and conductor size per your panel standard.
• Bonding – Ensure low‑impedance bonding to PE; poor bonding usually hurts SPD performance more than anything else.
• Coordination – Use appropriate upstream OCPD and, if required, a small pre‑fuse/MCB in line with the SPD manufacturer’s coordination table.
• Status checks – Inspect the indicator window during routine PM. If the device flags spent status, replace the cartridge/module promptly.
• Remote contact – If “WC” contact is present, monitor it via PLC to log degradation events and plan service during scheduled downtime.
• Cleaning – De‑energize; lightly dust with a dry, antistatic brush. No solvents.
• Firmware – Not applicable; no firmware updates are needed for this passive device.

Quality & Certifications

• Compliance – Typically supplied to IEC/EN 61643-11 Type 2 SPD requirements; CE and RoHS conformity are commonly available. Exact markings can vary by production lot.
• Safety – Intended for circuits ≤ 1,000 V AC; use only within the specified 250 VAC application for this model string.
• Warranty – 365 days standard warranty.

Recommended Accessories (optional)

• 35 mm DIN rail and end‑stops for secure mounting
• PE/CU earth bonding strap to minimize impedance to ground
• Appropriate upstream MCB/fuse per your panel coordination study
• Wire markers and cabinet labels for maintenance clarity

If you want, share your panel one‑line or a quick photo of the cabinet layout; I can double‑check coordination and lead routing so this model drops right in with minimal rework.