Fotek HPR-100DA — Single-Phase AC Solid State Relay, 100A, DC Control

Fotek · HPR Series · 100A DC-AC SSR · Panel Mount · In stock

The Fotek HPR-100DA is a single-phase AC solid state relay from Taiwan-based Fotek (FOTEK Solid State Relay), the well-known Taiwanese SSR specialist whose HPR series is the de-facto reference for high-current AC switching on Allen-Bradley, Siemens, and Mitsubishi control panels. The HPR-100DA delivers 100 A continuous load current from a 24–480 VAC mains side while the logic input accepts any 3–32 VDC signal coming straight from a PLC, temperature controller, or auxiliary power supply. The result is a zero-cross switching block that drops into a wide range of resistive and inductive heating loads in factory automation, process control, and OEM equipment.

1. Key Technical Specifications & Overview

2. Application Scenarios — Where It Fits

The HPR-100DA is a 100 A zero-cross AC SSR, so it is the natural choice anywhere an Allen-Bradley MicroLogix / CompactLogix, a Siemens LOGO! / S7-1200, or an Omron CP1E / CP1H digital output needs to switch a single high-power resistive or inductive AC load. The DC control input is wired straight to the PLC output module, and the AC load is wired to the screw terminals on top — no interposing relay required. Typical deployment categories we see from our Mitsubishi and Schneider integrator customers:

• Industrial ovens and furnaces — batch drying ovens, paint-bake ovens, and curing chambers where a temperature controller (e.g., Pan-Globe P909X-class controllers) drives the SSR from a 4–20 mA or relay output.
• Plastic extrusion and injection molding — barrel heater bands, hot-runner manifolds, and mold-temperature regulators on Siemens SIMATIC- or Mitsubishi MELSEC-controlled machines.
• Packaging and sealing — impulse heat sealers, form-fill-seal jaws, shrink tunnels, and hot-melt glue systems on food and pharmaceutical lines.
• Semiconductor wafer and FPD processing — hot-chuck and platen heaters that demand clean, low-noise zero-cross switching to avoid EMI on adjacent KEYENCE vision and laser-sensor cabling.
• Food & beverage heating — jacketed kettles, hot-fill lines, sterilizer-in-place (SIP) loops, and CIP rinse-water heating where 100 A switching class is common.
• HVAC and building-automation — electric reheat coils, duct heaters, and Yaskawa / Fanuc factory-floor comfort-heating banks.
• Kiln and ceramic firing — long-life, low-maintenance AC switching on electric pottery and industrial kilns where mechanical contactors used to weld shut.

3. Integration & Wiring Notes

The HPR-100DA has only four power terminals (two DC control, two AC load) plus a metal base, so physical wiring is short. The engineering judgment lives in protection, heatsinking, and correctly sizing the upstream fuse. The notes below are what our China sourcing team confirms on every customer drawing:

• Polarity of the DC control input is not observed. Terminals “+” and “−” on the input side are the constant-current input; a sinking or sourcing PLC output (PNP or NPN) from Omron CP1E, Allen-Bradley Micro820, or Siemens S7-1200 will drive the input either way.
• Use a high-speed semiconductor fuse (aR / gR class) on the AC load side, not a standard HRC fuse. The HPR-100DA can survive a dead short long enough for the fuse to clear only if the fuse is the right I²t class. Confirm fuse I²t is below the SSR's published I²t rating.
• Heatsink is mandatory at 100 A. The integrated aluminum base must be bolted to an external heatsink (or a water-cooled plate on a Schneider Altivar / Yaskawa Σ-7 cabinet). Apply a thin, even layer of thermal compound before bolting down.
• Wire gauge — the M5 screw terminals accept ring lugs for AWG 6 to AWG 2 (16–35 mm²). Torque to the value marked on the cover (typically 2.0–2.5 N·m). Loose lugs are the #1 cause of field failures on HPR-series SSRs.
• Snubber for inductive loads. For transformer-coupled or solenoid-coupled loads, add an RC snubber (or a varistor rated for the peak mains voltage) across the AC terminals. For purely resistive heating loads, a snubber is normally not required.
• Keep DC control and AC load wiring physically separated in the cabinet. Route the 3–32 VDC twisted pair away from the AC mains bundle, especially near KEYENCE CV-series vision processors and Panasonic FP7 PLC racks, to keep the image and analog I/O noise-free.
• Chassis ground the metal base to the cabinet PE bus. The aluminum base is at protective earth potential; never use it as a load conductor.

For engineers validating the analog I/O loop that drives the HPR-100DA, the PLC analog calculator and the PLC error code lookup pages translate the temperature controller's 4–20 mA / 0–10 V output into the setpoint band that the SSR will actually see on its DC input.

4. Installation & Commissioning Tips

A 100 A AC SSR carries serious heat and serious fault current. The commissioning steps below are the same ones our QC team uses on every Fotek HPR-series unit before it ships, and they are the steps that catch the most common field issues reported by Fanuc and Yaskawa OEM customers:

1. Inspect the cover and base before mounting. Look for cracked plastic, bent screw threads, or oxidation on the aluminum base. A bent base will not sit flat on the heatsink and will run hot.
2. Mount on a clean, flat heatsink surface. Use a spreader bar when tightening the M4 mounting screws so the base does not warp. Warping as little as 0.05 mm will push the thermal resistance up by 20 % or more.
3. Verify the input drive voltage with a multimeter on the DC terminals before applying AC mains. A PLC output that sags under load (common on long cable runs) will not latch the HPR-100DA's input and the LED will flicker.
4. First power-on with the load disconnected. Energize DC input, confirm the red LED on the cover lights, and measure the on-state voltage drop across the AC output terminals with a DMM in AC mode. You should see < 1.6 V with a small test load, or mains voltage with no load.
5. Thermal soak test. With the actual heater load connected, run the SSR at 100 % duty cycle for 30 minutes. Touch the heatsink — it should be warm, not untouchable. If the heatsink is too hot to hold, upsize the heatsink or add forced-air cooling.
6. Document the install in the real-time parts log so the next maintenance shift can quickly find a same-spec replacement (HPR-80DA, HPR-100DA, HPR-150DA) from the same Fotek family.
7. Plan for EOL. Fotek has kept the HPR series in production for years, but if a future redesign lands, our AI Diagnostic Tool can identify a cross-reference by nameplate photo and suggest an equivalent Fotek, Crydom, or Carlo Gavazzi part.

5. Procurement, Warranty & Lead Time

KOEED stocks the Fotek HPR-100DA as part of our solid-state-relay and power-control line for factory-automation customers. Pricing is RFQ-driven and we do not publish a fixed number on the page — send the quantity, the target load (resistive / inductive), and the heatsink situation and we will return availability and a quote within one business day.

• Quote turnaround: 24 hours on business days for single-PN RFQs. Multi-line BOMs typically return within 48 hours. Send your full list to Moritta@KOEED.COM.
• Lead time: in-stock units ship within 1–3 business days. Larger builds (50+ pieces) are quoted against fresh factory production and typically run 2–4 weeks.
• Warranty: 12 months against manufacturing defects, worldwide shipping via DHL / FedEx / UPS. See the return policy and shipping policy pages for full terms.
• Authenticity: every Fotek HPR-100DA ships in the original Fotek retail box with a model label and lot code, and is photographed before shipment in our product gallery.
• Bulk and frame-of-contract pricing: available for maintenance houses, system integrators, and EPC procurement teams. Use the Create a Quote form for multi-line BOMs, or email Moritta@KOEED.COM directly.
• Worldwide shipping — North America, Europe, the Middle East, South-East Asia and South America are all regular lanes. See our contact page for routing details and 24/7 reach.
• Cross-shopping: while you are here, browse the full Allen-Bradley, Siemens, Mitsubishi, Omron, Fanuc, Schneider, Yaskawa, Panasonic, and KEYENCE module and spare-parts catalogs, or open the AI Diagnostic Tool to look up an end-of-life replacement by nameplate photo.

Still have a question? The FAQ page covers the most common RFQ and lead-time scenarios, and the About KOEED page explains how our Shenzhen and Hong Kong sourcing teams put together BOMs that include commodity items like this SSR alongside active and EOL PLC modules.

Fotek is an independent solid-state-relay manufacturer based in Taiwan. KOEED is an independent multi-brand industrial-automation distributor and is not a subsidiary of Fotek, Allen-Bradley, Siemens, Mitsubishi, Omron, Fanuc, Schneider, Yaskawa, Panasonic, or KEYENCE. All brand names and part numbers are the property of their respective owners and are used here for cross-reference only.