A-B 700-FSA4UU23 Relay Base Module

A-B 700-FSA4UU23 Relay Base Module

The Allen-Bradley 700-FSA4UU23 is actually not a relay base module—it is a 700-FS series high-performance timing relay (on-delay function) used in industrial control circuits.

Product Information

• Brand: Allen-Bradley (Rockwell Automation)
• Series: 700-FS
• Part Number: 700-FSA4UU23
• Type: On-Delay Timing Relay
• Function: Time delay ON operation (adjustable delay before contacts switch)

Key Technical Data

• Supply voltage: 24–48V DC / 24–240V AC (50/60 Hz)
• Timing range: approx. 0.05 seconds to 60 hours
• Output contacts: 2 changeover (DPDT) relay outputs
• Mounting: DIN rail / plug-in base system
• Control type: Delay-on-energization (on-delay function)

Function (Simple Explanation)

This device is used to delay an electrical action after power is applied:

Example:

• Power ON → timer starts counting
• After preset time → relay output switches ON

It is commonly used when machines need a startup delay or sequencing control.

System Role

It is a standalone timing relay module, typically used instead of PLC logic in simple control systems:

Power supply → 700-FSA4UU23 timer relay → contact output → contactor / load

Typical Applications

• Motor delayed start circuits
• Conveyor sequencing control
• HVAC fan delay control
• Pump start delay systems
• Industrial automation timing logic
• Safety delay interlocks

Key Features

• Wide AC/DC input compatibility
• Adjustable long timing range (milliseconds to hours)
• DPDT output contacts for flexible wiring
• Compact DIN rail industrial design
• Reliable electromechanical timing control

Precautions

• Must match correct control voltage range
• Not a PLC module (no programmable logic)
• Contact load must not exceed rated current
• Mechanical relay wear over long-term switching cycles
• Proper wiring required for timing accuracy