Watlow CLS208

Description

Technical Specifications:

• Product Type: 8-channel solid-state relay (SSR) power output module

• Installation Method: Standard 35 mm DIN rail (compliant with EN 60715)

• Output Channels: 8 independent isolated channels

• Output Type: Zero-crossing AC solid-state relay

• Rated Voltage: 24–280 VAC (universal input)

• Maximum Load Current: 2 A per channel (resistive load, 40°C ambient)

• Total Module Current Limit: 10 A (all channels combined)

• Control Input Signal: 3–32 VDC (compatible with PLC transistor outputs)

• Response Time: <1/2 AC cycle (typical)

• Surge Current Capability: 50 A (16.7 ms half-wave)

• Operating Temperature: -20°C to +70°C (derating required >50°C)

• Ingress Protection Rating: IP20 (must be installed in enclosed control cabinet)

• Certifications: UL 508, cUL, CE (compliant with EMC Directive 2014/30/EU)

• Operating Voltage: 220 V

• Output Frequency: 30 kHz

• Input Current: 0.5 A

• Temperature Range: -55°C to 150°C

• Accuracy: ±0.5°C

• Dimensions: 140 x 110 x 90 mm

• Weight: 0.3 kg

• Mounting Width: 45 mm (DIN rail footprint)

Functional Features:

• Zero-Crossing Technology: Zero-crossing trigger ensures switching at AC voltage zero-crossing points, dramatically suppressing inrush current and electromagnetic interference (EMI)

• Independent Status LEDs: Per-channel independent status indication for rapid diagnostics

• Maintenance-Free Design: No moving parts, suitable for high vibration, cleanroom, or explosion-proof areas (with compliant enclosure)

• Compact High-Density Integration: 8 outputs occupy only 45 mm mounting width, saving over 50% panel space compared to discrete relays

• Redundant Circuit Design: Ensures continuous operation even if one control loop fails

Principle of Operation:
The CLS208 functions as the final execution stage in a distributed control system (DCS) or PLC architecture, converting control instructions into smooth, safe power output. Each of the 8 channels uses zero-crossing SSR technology to switch AC loads at the voltage zero-crossing point, minimizing inrush current and EMI while providing silent, wear-free operation.

Advantages and Strengths:

• Solid-state technology delivers no arcing, no wear, and over one million switching cycles of operational life

• Significant reduction in EMI protects sensitive instrumentation in labs, cleanrooms, or process plants

• Compact footprint reduces panel space by over 50%

• Proven reliability with zero failures over 3 years in medical sterilization equipment applications

• Dual AC/DC power supply compatibility eliminates need for separate power conversion units

Applicable Industries:
Manufacturing lines, electronics assembly, laboratory environments, plastics injection molding, semiconductor fabrication, precision plastics molding equipment, food processing (washdown environments), pharmaceutical reactors.

Model Series: CLS Series

Installation Requirements:
Standard 35 mm DIN rail mounting (EN 60715). Must be installed in an enclosed control cabinet due to IP20 rating.

Usage Precautions:

• Maximum load current derating required when operating above 50°C

• For detailed electrical specifications, installation instructions, and system integration, refer to official Watlow documentation

• Commonly paired with ABB DSQC robotics or GE VMIVME-7807 modules for synchronized process control