GC-40 Z-Wave High Current Relay Controller

Wireless Control · Serious Power GC-40 Z-Wave High Current Relay Controller Switch high-power loads with any Z-Wave hub. The GC-40 pairs an industrial 40 amp contactor with a Remotec Z-Wave module, so your smart-home controller handles only the low-voltage control circuit while the heavy contactor does the switching. The result is reliable wireless control of pumps, motors, heaters and other high-current equipment — with full electrical isolation between your electronics and the power side. Most Z-Wave switches top out around ½ HP and were never built to drive real loads. The GC-40 is engineered around a true power contactor and shipped pre-wired in a weatherproof enclosure, ready to install and control from anywhere. Key Features Z-Wave wireless controlPairs with any Z-Wave hub — SmartThings, Hubitat, Home Assistant and more — for on/off control and automation from anywhere. 40A industrial contactorA JQX-38F power contactor switches high-current loads that would overwhelm a standard smart relay. True electrical isolationThe Z-Wave control circuit is physically separated from the power circuit, protecting your hub and electronics. Rugged, weatherproof enclosureNEMA 4X (IP66) polycarbonate housing rated for indoor and outdoor installation. Tool-free WAGO connectionsLever connectors make control wiring fast, secure and maintenance-free — no soldering. Pre-wired and ready to installThe control side arrives factory-wired and tested — just add line and load with a licensed electrician. How It Works Your Z-Wave hub sends an ON/OFF command to the Remotec module. The module energizes the contactor's 120VAC control coil. The industrial contactor switches the high-power load on or off. Electrical isolation keeps the control circuit fully separate and safe. Specifications Relay / Contactor JQX-38F — 40A, 120VAC Z-Wave Module Remotec ZFM-80US Control Voltage 120VAC, 60Hz Contact Rating 40A resistive @ 120VAC (refer to relay datasheet for full load & duty ratings) Enclosure NEMA 4X (IP66) polycarbonate Control Wiring 16/18 AWG (factory installed) Load Wiring Not included — field installed by a licensed electrician Dimensions 6.7″ H × 5.7″ W × 3.5″ D Why the GC-40 Is Better Feature Standard Z-Wave Relay GC-40 Controller Switches high-power loads Limited (<½ HP) Up to 40A contact rating Electrical isolation No Yes Industrial contactor No Yes Rugged enclosure No Yes (NEMA 4X) Installation DIY / exposed Pre-wired / enclosed Ready for high current No Yes Built For Real-World Applications Water HeatersPool PumpsCompressorsAir HandlersHVAC SystemsLighting CircuitsIrrigation SystemsGarage & Shop EquipmentMotors & Fans Installation & Safety Professional installation required. The GC-40 is a component intended for installation by a qualified, licensed electrician. High-voltage wiring (line and load) is not included. Use appropriate conductor size and overcurrent protection for your application. The factory control wiring (16/18 AWG) is for the control circuit only and is not rated for high-current loads. Final circuit rating is determined by the installed conductor size, terminal ratings, connected load, and applicable electrical codes. Powered by Z-Wave Smarter Than Wi-Fi for Controlling Real Devices Z-Wave is a wireless technology built for one job: controlling the things in your home reliably. It runs on its own low-power network, so it stays fast and steady where Wi-Fi gets crowded and drops out. How Z-Wave Works Instead of every device shouting at a single Wi-Fi router, Z-Wave devices form a self-healing mesh network. Each mains-powered device also acts as a repeater, passing signals along until they reach your hub. Add more devices and the network gets stronger and wider, not weaker. 1. Your Hub A Z-Wave hub (SmartThings, Hubitat, Home Assistant and more) is the brain that sends your commands. 2. The Mesh Signals hop device-to-device across a low-power sub-1 GHz band, away from Wi-Fi congestion. 3. The Device Your controller receives the command and switches the load — lights, pumps, motors, heaters and more. Z-Wave vs. Wi-Fi What matters Typical Wi-Fi Device Z-Wave Wireless band Crowded 2.4 GHz, shared with phones, laptops & neighbors Dedicated sub-1 GHz band — far less interference Network shape Every device back to one router (single point of failure) Self-healing mesh — devices relay for each other Range & walls Weakens through walls and floors Lower frequency penetrates better; mesh extends it further Impact on your internet Uses router bandwidth & IP addresses; can slow browsing Runs on its own network — your Wi-Fi stays free Power use High — battery devices drain quickly Very low — battery sensors can last for years Reliability Often depends on the cloud & a strong signal Local mesh control keeps working even in a busy RF environment Works together Brand apps that don't always talk to each other Certified devices from any brand interoperate, with modern S2 security The bottom line: Wi-Fi is great for streaming and browsing — but for switching devices on and off dozens of times a day, you want a network built for control. Z-Wave delivers fast, reliable, low-power commands without ever clogging your internet. This controller pairs with any Z-Wave hub, so it drops right into the ecosystem you already have. Z-Wave is purpose-built for control signals rather than high-bandwidth data like video, and North American Z-Wave operates around 908 MHz. Actual range and device limits vary by hub and installation.