FOTEK SSR-25AA-H Single-Phase Solid State Relay AC Control

Description

The Fotek SSR-25AA-H is an industrial-grade single-phase solid state relay engineered for contactless power switching in harsh automation environments. Built with zero-crossing triac/back-to-back SCR switching architecture, it prevents inductive load inrush transients and minimizes electromagnetic interference (EMI). This device delivers spark-free, high-speed switching and extended operational life compared to mechanical contactors.

Model Code Breakdown:
Series: SSR (Single-Phase Solid State Relay)
Rated Current: 25 (25 Amperes Continuous at rated heatsink cooling)
Control Input Type: A (AC Control Voltage, 80~250 VAC)
Output Load Type: A (AC Load Voltage)
Voltage Class: H (High-Voltage Grade, rated 90~480 VAC)

Technical Specifications:

Input (Control) Parameters:
Control Voltage Range: 80 to 250 VAC (50/60 Hz)
Must Turn-On Voltage: 70 VAC
Must Turn-Off Voltage: 35 VAC
Input Current Draw: 6.0 mA max at 220 VAC
Control Indicator: High-Luminance Red LED

Output (Load) Parameters:
Rated Load Current: 25 A RMS (nominal with appropriate thermal interface)
Load Voltage Range: 90 to 480 VAC (50/60 Hz)
Minimum Operating Current: 100 mA
Peak Repetitive Reverse Voltage: 800 Vpk
Non-Repetitive Surge Current (1 cycle, 60Hz): 250 A
Maximum On-State Voltage Drop: 1.6 VAC at rated current
Maximum Off-State Leakage Current: 3.0 mA at 220 VAC
Switching Type: Zero Crossing Trigger
Turn-On Time: ≤ 10 ms
Turn-Off Time: ≤ 10 ms
Critical Rate of Rise of Off-State Voltage (dv/dt): 200 V/µs minimum

Insulation and Dielectric Parameters:
Dielectric Strength (Input to Output): 4000 VAC for 1 minute
Dielectric Strength (Terminals to Baseplate): 4000 VAC for 1 minute
Insulation Resistance: 50 MΩ minimum at 500 VDC

Mechanical and Physical Characteristics:
Housing Material: UL 94V-0 Flame Retardant Engineering PBT
Baseplate Material: Heavy-Gauge Anodized Aluminum Plate
Terminal Configuration: M4 Screw Terminals with Integrated Protective Safety Cover
Mounting Configuration: Panel / Heatsink Mount via dual M4 fixing holes
Mounting Hole Pitch: 47.5 mm ± 0.2 mm (Standard Hockey Puck Footprint)
Dimensions: 58.0 mm x 44.8 mm x 28.8 mm
Weight: 105 g ± 5 g

Environmental Ratings:
Operating Temperature Range: -20°C to +80°C
Storage Temperature Range: -30°C to +100°C
Operating Humidity: 45% to 85% RH (non-condensing)
Standards and Approvals: CE Compliant, RoHS Compliant, ISO 9001 Factory Quality Control

Target Application and Problem Resolution:
The SSR-25AA-H is optimized for precision thermal control in plastic injection molding machines, extrusion heating barrels, packaging heat-sealing jaws, reflow soldering ovens, and industrial furnaces. In high-frequency duty cycle scenarios where traditional electromechanical contactors fail due to contact welding, arc erosion, and mechanical fatigue, this solid state relay provides continuous, maintenance-free operation.

Technical Compatibility and Procurement:
Technical Compatibility: Fully standardized mechanical and electrical footprint compatible with standard single-phase industrial SSR sockets, DIN rail heatsink assemblies, and legacy SSR units from major global industrial brands. For loads operating continuously above 5 A, installation on an aluminum heat sink with thermal conductive paste is mandatory.
Original Engineering: Authentic Fotek manufacturing ensures strict compliance with rated switching margins and thermal dissipation tolerances.
Lead Time: Maintained under active stock distribution for rapid global fulfillment and minimal factory downtime.

Key Attributes
Brand Name: FOTEK
Model Number: SSR-25AA-H
Type: Single-phase
Relay Type: Single-phase
Mounting Type: Screw
Place of Origin: Taiwan, China
Description: -
Application: Load heating
Output Type: Exchange
Coil Type: AC control AC
Circuit: -
Connector Type: -
Voltage - Output: 90~480VAC
Contact Rating (Current): 25A
Voltage - Input: 80~250VAC
Switching Voltage: <35VAC
Current - Input: -
Contact Form: -
Voltage - Load: -
On-State Resistance (Max): -
Current - Output: -
Termination Style: -
Load Current: -
Coil Current: -
Coil Voltage: -
Series: SSR-AA
Features: -
Model: SSR-25AA-H
Rated current: 25A
Fusing current: 259A²S
Withstand breakthrough current: 275A
Withstand breakthrough voltage: 1200VAC min.
Output voltage: 90~480VAC
Lnput voltage: 80~250VAC
Turn off voltage: <35VAC

Packaging and Delivery
Selling Units: Single item
Single package size: 6.1X4.5X3 cm
Single gross weight: 0.100 kg