Watlow ASPYRE SCR Power Controllers

Intelligent SCR power for industrial heater loads. Entherm helps you size the right ASPYRE, pair it with Watlow temperature controls, and integrate it into a complete thermal system.

Watlow’s ASPYRE family gives you flexible, scalable SCR power control for ovens, furnaces, kilns, heat treat, plastics, packaging, and other process heating work. Two platforms cover light multi-zone duty through high-current plant loads: ASPYRE AT and ASPYRE DT.

Family Overview

Platform	Current	Phases / legs	Line & load voltage	Best fit
ASPYRE AT	12 A, 24 A, or 48 A	Single-phase, 1 controlled leg	100 to 480 V	Compact multi-zone systems; pairs with Watlow EZ-ZONE RM, RMA PLUS, and PM PLUS
ASPYRE DT	35 A to 2100 A (at 40°C ambient)	1-phase 1-leg; 3-phase 2-leg; 3-phase 3-leg	Up to 480 V, 600 V, or 690 V options (690 V on 60 A and greater)	Wide heater loads from single-phase panels to large three-phase process heat

Ratings above are from Watlow ASPYRE DT and ASPYRE AT specification sheets. Final model selection depends on load type, ambient temperature, and wiring. Entherm will help you pick the right unit.

Firing Modes

ASPYRE DT

Zero cross, burst fire, single cycle, delayed triggering, phase angle, soft start, and half-cycle, with additional start-ramp and safety-ramp combinations for single-phase and selected three-phase models.

ASPYRE AT

Fixed time-base zero crossing, variable time-base zero crossing (burst firing), phase angle, and soft start for a wide range of resistive heater loads.

Control and feedback options on DT include contactor, voltage, current, or power modes, with voltage, voltage-squared, current, current-squared, power, open-loop, and external feedback. AT supports voltage, voltage-squared, current, current-squared, and power control modes.

Load Diagnostics

ASPYRE DT

Heater break (open)
SCR short circuit (closed)
Current limit
Thermal protection messages
Communication watchdog
Bakeout in process
Auxiliary voltage high/low
Voltage line loss
On 1100 A to 2100 A models: blown fuse and fan failure messages

ASPYRE AT

Open load circuit, including heater break
Partial load failure
SCR short circuit
Current limit
Thermal alarm
Line voltage loss

Both platforms offer heater bakeout to protect heaters at start-up. On DT, current limiting and heater bakeout are available on single-phase models and three-phase three-leg models from 60 A to 2100 A.

Communications

ASPYRE DT

Modbus RTU (RS-485) standard
Optional Modbus TCP
Optional EtherNet/IP
Optional PROFIBUS DP
Optional PROFINET
USB device for configuration and data-file transfer

ASPYRE AT

USB for COMPOSER configuration
Optional Modbus RTU (EIA-485)
High-speed inter-module bus to Watlow controllers
Via EZ-ZONE RM, RMA PLUS, or PM PLUS: Modbus TCP, EtherNet/IP, or EtherCAT in a Watlow ecosystem solution
Up to 16 ASPYRE AT units from one temperature-control connection

How Entherm Helps

You do not have to figure out SCR sizing alone. Entherm’s application team works with you to match ASPYRE to your heater load, line voltage, and control strategy, then builds the rest of the loop around it.

Size & Select

We review load type (nichrome, SiC, moly, IR, transformer-coupled, and more), current, phase, and duty so you get the right ASPYRE DT or AT model the first time.

Pair with Watlow Controls

ASPYRE sits cleanly next to Watlow temperature and process controllers. AT is designed to work with EZ-ZONE RM, RMA PLUS, and PM PLUS as part of a Watlow ecosystem.

UL 508 Control Panels

Entherm builds UL 508 control panels that bring heaters, sensors, Watlow controls, and ASPYRE power into one engineered package.

End-to-End Integration

In-house engineering ties the thermal loop together: power, control, sensing, and panel layout, so you receive one working system instead of a pile of parts.

We are based in Minnesota and support customers across the Upper Midwest, and we ship Watlow products and Entherm panels worldwide.

Ready to size an ASPYRE for your heater load?

Email sales@entherm.com Call 1-877-ENTHERM

Toll-free 1-877-368-4376 | Local 952-888-1771

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ASPYRE, Watlow, EZ-ZONE, PM PLUS, RMA PLUS, and COMPOSER are trademarks or registered trademarks of Watlow Electric Manufacturing Company. Specs summarized from Watlow ASPYRE DT and ASPYRE AT materials; confirm final ratings on the Watlow datasheet for your model.