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EZ-ZONE® ST Controller 

The EZ-ZONE® ST integrated solid state controller from Watlow® offers a complete thermal system control solution in a single package. Features include a PID temperature controller connected to a high-amperage solid state relay with the option of adding a properly sized heat sink, an over- and  under-temperature limit, a power shut-down contactor and digital communications in one complete and professionally engineered product.

Because the solid state controller system is modular and scalable, a user only pays for what is needed. Stacking the EZ-ZONE ST integrated controller into multiple configurations enables flexibility to standardize the product platform to solve a wide range of application needs.


Control/Limit Loops:  1/1
Alarms:  2
Mounting:  DIN-rail
Max Output:  75A
Output Firing:  Zero Cross, Phase Angle
Phase Configurations:  1
Ambient Operating Range:  -18 to 70°C  (0 to 158°F)
Agency Approvals:  UL® , CSA, CE, IP65/NEMA 4X indoor use RUI, RoHS, W.E.E.E., FM (limit feature)
Communication Protocols:  Standard Bus, Modbus® RTU, EtherNet/IP™, DeviceNet™, PROFIBUS DP or Modbus®
Adaptive Tuning TRU-TUNE+: 
Remote Limit Reset:  Yes, if digital inputs are ordered
Display Height:  2.05 in. (52.07 mm)
Dimensions:  7.0 in. H (177.8 mm) x 2.5 in. W (63.5 mm) x 6.14 in. D (156 mm)
Warranty (years):  3
Note: The specifications in the table above are best available values in each category. Not all combinations of these values are available in a single model number.

Features & Benefits:

Features Benefits
Back panel or DIN-rail mount
  • Provides several mounting options
Off-the-shelf designed system solution
  • Improves system reliability and termination reduction
  • Reduces installation cost
  • Eliminates incompatibility headaches often encountered with using many different components and brands
Touch-safe package
  • Complies with IP2X increasing user safety
±0.1 percent temperature accuracy
  • Provides efficient and accurate temperature control
Agency approvals: UL®, CSA, CE, RoHS, W.E.E.E.
  • Meets applications requiring agency approvals
PID temperature control
  • Allows single input/ dual output
  • Allows standard PID or adaptive Tru-Tune+ tuning algorithms for demanding controllability requirements
Ability to communicate with programmable logic controller (PLC), personal computer (PC) or operator interface terminal (OIT)
  • Optional EIA 485 Modbus® RTU
  • RUI/communications gateway with optional EIA 232/485 Modbus® RTU, EtherNet/IP™, Modbus® TCP, DeviceNet™ or PROFIBUS DP
Solid state relay output
  • Allows faster cycling, more precise control, increased heater life and improves energy efficiency
  • Ability to handle up to 75 amperes
  • Uses either zero-cross or phase angle control modes for flexibility to control resistive loads such as nichrome, tungsten or quartz lamps

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Related Literature

Specification Sheets (8)

Brochures (3)

Software and Demos (12)

User Manuals (2)

Training and Education (9)

White Papers (12)

Quality Certificates (1)

Agency Approvals (1)

Catalogs (4)



EZ-ZONE ST Controller
EZ-ZONE ST Controller