MGR MGR-1 A4840 40A AC-to-AC Solid State Relay

The MGR MGR-1 A4840 is a single-phase AC-to-AC solid state relay (SSR) designed for switching AC electrical loads using an AC control signal. It features a 40A rated output current, a 24–480VAC load voltage range and a 70–280VAC control input range.

Unlike traditional electromechanical relays, this solid state relay uses semiconductor switching technology without mechanical switching contacts. It is suitable for compatible industrial automation, electrical heating, temperature control and AC power-switching applications.

Key Features

• Original MGR-branded solid state relay design
• Model: MGR-1 A4840
• Single-phase AC-to-AC switching
• 40A rated output current
• 24–480VAC load voltage range
• 70–280VAC AC control input
• Solid-state semiconductor switching
• No mechanical switching contacts
• LED status indicator
• Four screw-terminal electrical connections
• Panel-mount design with mounting holes
• Suitable for compatible industrial AC load-control systems

Technical Specifications

Brand	MGR
Model	MGR-1 A4840
Product Type	Solid State Relay (SSR)
Relay Configuration	Single-Phase AC-to-AC
Control Input Voltage	70–280VAC
Load Output Voltage	24–480VAC
Rated Load Current	40A
Operating Frequency	50/60Hz (Output Label)
Output Terminals	1 and 2
Control Terminals	3 and 4
Status Indicator	LED
Mounting Type	Panel / Heatsink Mount
Terminal Connection	Screw Terminals

AC-to-AC Solid State Switching

The MGR-1 A4840 is designed to control AC loads using an AC control signal. When the appropriate control voltage is applied, the semiconductor output stage switches the connected AC load according to the relay's switching characteristics.

40A AC Load Switching

The relay is marked with a 40A load-current rating and supports a stated load-voltage range of 24–480VAC.

Actual continuous current capability depends on appropriate heatsinking, ambient temperature, electrical installation and load characteristics.

70–280VAC Control Input

The relay accepts an AC control signal from 70VAC to 280VAC, making it suitable for compatible industrial control circuits using AC switching signals.

This model should not be confused with DC-input solid state relays that require 3–32VDC or other DC control voltages.

Typical Applications

• Industrial Heating Equipment
• Electric Heater Control
• Temperature Control Systems
• Industrial Automation Panels
• AC Load Switching
• Packaging Machinery
• Textile Machinery
• Industrial Ovens
• Resistive Heating Loads
• Electrical Control Equipment
• Machine Repair and Maintenance

Installation and Cooling

Solid state relays generate heat during operation. When operating at higher load currents, the MGR-1 A4840 should be installed with an appropriately sized heatsink and suitable thermal interface material.

Use suitable overcurrent protection, wiring and terminal connections. Installation should be performed by a qualified electrical technician because both the control and load circuits operate at potentially hazardous AC voltages.