Potter & Brumfield SDAS-01-7Y2S1024

Control Input Side Electrical Parameters

• Rated Control Input Voltage Range: 3–32 VDC wide-range universal DC control signal input
• Rated Control Input Operating Current: 12 mA (at 24 VDC input voltage)
• Minimum Trigger Input Current: 5 mA (minimum DC current required to fully turn on the internal solid-state switch)
• Input Reverse Polarity Protection: Built-in anti-reverse diode circuit at the control input terminal; no circuit damage when positive and negative DC control wires are reversely connected by mistake on site

AC Load Output Side Electrical Parameters

• Rated Continuous AC Load Current: 7 A RMS single-channel output
• Allowable AC Load Operating Voltage Range: 24–240 VAC 50/60 Hz universal industrial AC voltage
• Switching Trigger Mode: Built-in AC voltage zero-crossing detection circuit; only turns on the solid-state switch when the AC sine wave voltage crosses zero point, effectively suppressing inductive load switching voltage surge and electromagnetic interference generation
• Maximum Non-Repetitive Surge Load Current: 140 A peak (surge duration ≤ 10 ms), can withstand instantaneous large starting current of AC motor and heating resistance loads without internal chip damage
• Off-State Leakage Current: ≤ 1.5 mA RMS at rated 240 VAC output voltage, no false action of small AC loads caused by residual leakage current after the control input signal is cut off

Isolation & Safety Parameters

• Optical Isolation Rating Between Control Input and Load Output Circuits: 2500 V RMS withstand isolation voltage, completely separating low-voltage DC control circuits and high-voltage AC load circuits, eliminating ground loop interference and electric shock hazards for maintenance personnel
• Insulation Material Fire Resistance Grade: UL94-V0 flame retardant plastic module housing, self-extinguishing after fire source is removed, no open flame spread

Environmental & Physical Specifications

• Continuous Operating Ambient Temperature Range: -20°C ~ +70°C
• Storage Temperature Range: -40°C ~ +85°C
• Allowable Working Relative Humidity: 10% ~ 90% non-condensing
• Mechanical Mounting Form Factor: Standard compact rectangular panel-mount module, reserved two through-hole mounting lugs on both sides of the module housing for fixed installation on electrical cabinet mounting plates or equipment control panels
• Overall Module Dimensions: Standard industrial miniature SSR module size, small footprint to save cabinet internal installation space

Functional Features

1. Non-Contact Silent Zero-Crossing AC Switching Function: The internal zero-crossing trigger circuit ensures that the solid-state switching chip only conducts when the AC load voltage sine wave crosses the zero potential point; compared with random-phase switching solid-state relays, it greatly reduces the instantaneous inductive voltage surge generated when switching inductive loads such as AC solenoid valves and small motors, suppresses high-frequency electromagnetic interference radiated to surrounding weak signal circuits, avoids abnormal signal distortion and false triggering of adjacent sensors and control modules in the cabinet. There are no mechanical moving contacts inside the module during the whole switching process, so there is no mechanical bounce impact noise and contact arc discharge phenomenon, which is suitable for noise-sensitive workshop production environments and closed silent test equipment cabinets.
2. Wide-Range Universal DC Control Input Compatibility: The control input terminal supports a wide DC voltage input range of 3 VDC to 32 VDC, which can be directly driven by digital output signals of various mainstream brand PLCs (24 VDC transistor output), temperature control instruments, timing relays and small single-chip control boards on the market without matching additional voltage conversion isolation adapter circuits, greatly simplifying the on-site control circuit wiring design and reducing auxiliary electrical component procurement costs. The built-in reverse polarity protection diode circuit effectively avoids module internal circuit burnout caused by mis-reversing the positive and negative poles of the DC control signal wire during field wiring construction or later equipment maintenance wiring modification.
3. High Load Current Bearing & Strong Surge Impact Resistance: The single-channel AC load output supports a continuous rated load current of 7 A RMS, which can directly drive most common small industrial AC load equipment including AC solenoid valves, heating resistance tubes, fan motors, indicator light groups and conveyor auxiliary actuators without matching intermediate relay transfer circuits. The internal solid-state switching chip has a strong instantaneous surge current resistance capability, which can withstand a peak surge current of up to 140 A within 10 milliseconds, fully coping with the instantaneous large starting inrush current generated by AC motor inductive loads and cold-state heating resistance loads at the moment of power-on switching, avoiding instantaneous surge current breakdown of the internal semiconductor switch chip and permanent module failure.
4. High Dielectric Strength Optical Isolation Safety Design: An independent high-speed linear optocoupler isolation circuit is arranged between the DC control input circuit and the AC load output circuit inside the module, with a dielectric withstand isolation voltage of up to 2500 V RMS; the low-voltage DC control circuit connected to the PLC control system and the high-voltage AC load circuit connected to the on-site power supply are completely electrically isolated by the optocoupler barrier. Even if a short-circuit fault occurs in the high-voltage AC load circuit, the high-voltage surge cannot penetrate the isolation layer to backflow and damage the expensive PLC digital output module and upper control equipment; meanwhile, the isolation barrier eliminates ground loop current formed by different grounding potentials between the control cabinet and field load equipment, avoiding unstable control signal faults caused by ground loop noise.
5. Ultra-Low Off-State Leakage Current to Prevent False Load Actuation: After the DC control input signal is completely cut off, the residual leakage current of the AC output terminal is controlled below 1.5 mA RMS under the rated 240 VAC working voltage; the ultra-small leakage current cannot drive small-power AC loads such as miniature indicator lights and small solenoid valves to generate false opening and false closing misoperation faults, eliminating the hidden danger of abnormal equipment action caused by residual leakage current after the control signal is disconnected in automated production line control circuits.
6. Compact Miniature Panel Mount Structure with Convenient Installation & Maintenance: The whole module adopts a miniature compact rectangular structural design, occupying very small installation space on the electrical cabinet backboard or equipment control panel, which is convenient for dense layout and centralized installation of multiple solid-state relay modules in small-sized integrated control cabinets. Two symmetrical through-hole mounting lugs are integrally formed on both sides of the module flame-retardant plastic housing; the module can be quickly fixed on the cabinet metal mounting plate by using standard M3 or M4 machine screws without purchasing special installation accessories, and disassembly and replacement during later equipment fault maintenance are also simple and fast, effectively shortening the equipment downtime of the automated production line.