Signal Relays, Up to 2 Amps

Part Number	Description / PDF	Quantity
2900310 Phoenix Contact	RELAY GP SPDT 50MA 120VAC/DC	0
2903364 Phoenix Contact	RELAY GEN PURPOS SPST 50MA 24VDC	38
2826266 Phoenix Contact	ST-REL3-KG230/21/AU/SO46	0
2903351 Phoenix Contact	RELAY GEN PURP SPDT 50MA 230VAC	9
2967112 Phoenix Contact	RELAY GEN PUR DPDT 50MA 24VAC/DC	1010
2903335 Phoenix Contact	RELAY GEN PURP SPDT 50MA 230VAC	1
2967138 Phoenix Contact	RELAY GP DPDT 50MA 120VAC/DC	1
2903343 Phoenix Contact	RELAY GEN PURP DPDT 50MA 230VAC	8
2903353 Phoenix Contact	RELAY GEN PURPOS SPDT 50MA 24VAC	2840
2966919 Phoenix Contact	RELAY GEN PURPOS SPDT 50MA 12VDC	26
2967277 Phoenix Contact	RELAY GEN PURPOS DPDT 50MA 12VDC	6
2903344 Phoenix Contact	RELAY GEN PURP DPDT 50MA 120VAC	65100
2966320 Phoenix Contact	RELAY GP SPST 50MA 120VAC/DC	3
2900315 Phoenix Contact	RELAY GP SPST 50MA 230VAC/DC	740
2940090 Phoenix Contact	RELAY GEN PURPOS SPDT 50MA 24VDC	43
2903354 Phoenix Contact	RELAY GEN PURPOS SPDT 50MA 24VDC	5520
2903346 Phoenix Contact	RELAY GEN PURPOS DPDT 50MA 24VDC	10140
2900309 Phoenix Contact	RELAY GEN PURPOS SPDT 50MA 60VDC	6
2903360 Phoenix Contact	RELAY GEN PURPOS SPST 50MA 12VDC	0
2903337 Phoenix Contact	RELAY GEN PURPOS SPDT 50MA 24VAC	99550

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.