Demand Response Controller
Wireless load switching for real-time demand response. Enable grid operators and aggregators to manage distributed loads with sub-second precision across your entire building portfolio.
Sub-Second Demand Response Switching
The ZDR series delivers sub-second relay switching for demand response events, enabling participation in fast-acting grid services such as frequency response and capacity markets. When a demand response signal arrives at the EpiSensor gateway, the ZDR activates immediately, shedding or shifting loads according to pre-configured rules. This rapid response time ensures compliance with even the most demanding grid programme requirements.
ZigBee Mesh Network Integration
The ZDR communicates wirelessly via ZigBee, joining the self-healing mesh network coordinated by the EpiSensor gateway. This eliminates the need to run control cables to each load point, dramatically reducing installation time and cost. The mesh topology means each ZDR can relay signals for other devices, extending network coverage throughout large buildings and multi-floor facilities without additional infrastructure.
Dual Relay Outputs with Status Feedback
Each ZDR unit provides two independent relay outputs, allowing control of multiple load circuits from a single device. The relays support both normally-open and normally-closed configurations, giving installers flexibility in how loads are wired. Built-in status feedback confirms relay state back to the gateway, providing full visibility and audit trails for every demand response event -- essential for programme verification and settlement.
Configurable Override and Failsafe Behaviour
Building operators retain full control with configurable override settings. If communication with the gateway is lost, the ZDR falls back to a pre-defined safe state -- either maintaining the current relay position or reverting to a default configuration. Local override switches allow on-site personnel to manually control loads when needed, ensuring that critical systems are never compromised by demand response events.
DIN-Rail Mounting, Industrial-Grade Design
Designed for commercial and industrial electrical panels, the ZDR mounts on standard 35mm DIN rail alongside existing switchgear. The compact form factor minimises panel space requirements, and screw terminals provide secure, vibration-resistant connections. Powered directly from the mains supply via an internal power supply, the ZDR requires no additional power adapters or external transformers.
Specifications
| Model | ZDR-2X |
| Relay Outputs | 2 x independent relay outputs (NO/NC configurable) |
| Relay Rating | 16A resistive at 250V AC |
| Switching Time | Sub-second response |
| Wireless | ZigBee (IEEE 802.15.4), 2.4 GHz |
| Mounting | DIN-rail (35mm) |
| Power Supply | 85-265V AC (internal PSU) |
| Enclosure | Industrial-grade, IP20 |
| Operating Temperature | -20°C to +55°C |
| Certifications | CE |
Use Cases
Frequency Response
Participate in grid frequency response programmes by rapidly shedding non-critical loads such as HVAC, lighting, and water heating.
Capacity Market
Aggregate demand reduction across building portfolios for capacity market participation and revenue generation.
Peak Shaving
Automatically curtail loads during peak demand periods to reduce maximum demand charges and network costs.
Related Products
Wireless Electricity Monitor
ZEMPair with the ZDR for closed-loop demand response with real-time power measurement verification.
Learn MoreZGW-10 Gateway
ZGWThe central hub that coordinates all ZDR units and connects to demand response platforms.
Learn MoreWireless Digital Signal Sensor
ZPC/ZDIMonitor meter pulse outputs alongside demand response for complete energy visibility.
Learn MoreReady to Deploy Demand Response?
Talk to our team to learn how the ZDR series can enable demand response across your building portfolio.