Signal Relays, Up to 2 Amps

Part Number	Description / PDF	Quantity
2903328 Phoenix Contact	RELAY GEN PURP DPDT 50MA 120VAC	17380
2903352 Phoenix Contact	RELAY GEN PURP SPDT 50MA 120VAC	1570
2966281 Phoenix Contact	RELAY GP SPDT 50MA 120VAC/DC	353380
2903336 Phoenix Contact	RELAY GEN PURP SPDT 50MA 120VAC	104240
2903329 Phoenix Contact	RELAY GEN PURPOS DPDT 50MA 24VAC	440
2966278 Phoenix Contact	RELAY GEN PUR SPDT 50MA 24VAC/DC	15200
2903365 Phoenix Contact	RELAY GEN PURPOS SPST 50MA 12VDC	38
2903330 Phoenix Contact	RELAY GEN PURPOS DPDT 50MA 24VDC	446960
2900306 Phoenix Contact	RELAY GEN PURPOS SPDT 50MA 24VDC	104800
2903373 Phoenix Contact	RELAY GEN PURPOS SPDT 50MA 12VDC	430
2903369 Phoenix Contact	RELAY GEN PURPOS SPDT 50MA 12VDC	275
2964843 Phoenix Contact	RELAY GP DPDT 500MA 230VAC/DC	0
2900350 Phoenix Contact	RELAY GEN PURPOS DPDT 50MA 72VDC	0
2900341 Phoenix Contact	RELAY GEN PURPOS DPDT 50MA 60VDC	0
2900322 Phoenix Contact	RELAY GEN PURPOS SPDT 50MA 72VDC	0
2967280 Phoenix Contact	RELAY GEN PURPOS DPDT 50MA 48VDC	0
2900321 Phoenix Contact	RELAY GEN PURPOS SPDT 50MA 24VDC	30
2964461 Phoenix Contact	RELAY MODULE DIN RAIL 1PST 120V	0
2900323 Phoenix Contact	RELAY GEN PURP SPDT 50MA 110VDC	0
2823722 Phoenix Contact	RELAY GP SPST 500MA 24VAC/DC	0

Signal Relays, Up to 2 Amps

1. Overview

Signal relays with ratings up to 2 amps are electromechanical or solid-state switching devices designed to control low-power electrical circuits. These components enable signal transmission isolation, circuit amplification, or switching automation in modern electronic systems. Their compact size and precise control capabilities make them essential in automation, telecommunications, and precision instrumentation systems.

2. Major Types and Functional Classification

Type	Functional Characteristics	Application Examples
Electromagnetic Relays	Mechanical switching via electromagnetic coil, standard form factor	Industrial control panels, HVAC systems
Solid-State Relays	No moving parts, zero-crossing switching, fast response	Temperature control systems, LED lighting
Reed Relays	Hermetically sealed contacts, high-speed operation	Telecom switching, test equipment
Time Delay Relays	Programmable switching intervals	Machinery automation, motor starters
High-Frequency Relays	Designed for RF/microwave signal paths	Wireless infrastructure, radar systems

3. Structure and Components

Typical construction includes:

Coil assembly (copper winding on bobbin)
Contact system (fixed and movable contacts)
Insulation housing (flame-retardant polymer)
Magnetic circuit (iron core and yoke)
Terminal system (PCB pins or screw terminals)

Advanced models incorporate EMI suppression circuits and LED status indicators.

4. Key Technical Parameters

Parameter	Typical Value	Importance
Rated Current	1-2 A resistive	Determines load capacity
Coil Voltage	5-48 VDC nominal	Dictates control circuit design
Contact Resistance	<50 m	Impacts signal integrity
Insulation Resistance	>100 M	Safety isolation performance
Mechanical Life	10-100 million operations	Durability indicator
Switching Speed	5-15 ms (EMR), <1 ms (SSR)	System response time

5. Application Fields

Industrial automation (PLCs, sensor interfaces)
Telecom infrastructure (signal routing switches)
Medical equipment (diagnostic device controls)
Smart home systems (HVAC thermostats)
Test & measurement (ATE machine interfaces)

6. Leading Manufacturers and Products

Manufacturer	Product Series	Key Features
Omron	G5LE-14-DC5	5 mm spacing, 2 A rating
Phoenix Contact	PSR-SCP-24UC	Plug-in design, LED indicators
TE Connectivity	RTX-S-DC5V	Automotive qualified
Siemens	3RT2025	Modular mounting system

7. Selection Recommendations

Key considerations:

Load type (resistive/inductive)
Environmental conditions (temperature/humidity)
Required make/break cycles
Regulatory certifications (UL/CSA/IEC)
PCB footprint constraints

Example: For medical equipment, select RoHS-compliant reed relays with 1.5 A rating and reinforced insulation.

8. Industry Trends

Current developments include:

Transition to surface-mount solid-state alternatives
Integration with IoT-enabled monitoring systems
Nanocoating for harsh environment protection
Increased adoption of 1 Form C contacts
Miniaturization (sub-10 mm package development)

Market forecasts predict 5.2% CAGR through 2027 driven by industrial automation growth.