Signal Relays, Up to 2 Amps

Part Number	Description / PDF	Quantity
2900313 Phoenix Contact	RELAY GEN PURPOS SPST 50MA 24VDC	1390
2903359 Phoenix Contact	RELAY GEN PURPOS SPST 50MA 24VDC	224
2903372 Phoenix Contact	RELAY GEN PURPOS SPDT 50MA 24VDC	3
2966294 Phoenix Contact	RELAY GP SPDT 50MA 230VAC/DC	2
2900307 Phoenix Contact	RELAY GEN PUR SPDT 50MA 24VAC/DC	20
2900314 Phoenix Contact	RELAY GP SPST 50MA 120VAC/DC	0
2900317 Phoenix Contact	RELAY GEN PURPOS SPDT 50MA 12VDC	4
2903327 Phoenix Contact	RELAY GEN PURP DPDT 50MA 230VAC	5
2967125 Phoenix Contact	RELAY GEN PURPOS DPDT 50MA 24VDC	68480
2900311 Phoenix Contact	RELAY GP SPDT 50MA 230VAC/DC	0
2900339 Phoenix Contact	RELAY GEN PUR DPDT 50MA 24VAC/DC	6
2900308 Phoenix Contact	RELAY GEN PURPOS SPDT 50MA 48VDC	1
2900342 Phoenix Contact	RELAY GP DPDT 50MA 120VAC/DC	0
2966317 Phoenix Contact	RELAY GEN PURPOS SPST 50MA 24VDC	961390
2903338 Phoenix Contact	RELAY GEN PURPOS SPDT 50MA 24VDC	5160
2832027 Phoenix Contact	ST-REL3-KG230/21/SO46	0
2903368 Phoenix Contact	RELAY GEN PURPOS SPDT 50MA 24VDC	342440
2966265 Phoenix Contact	RELAY GEN PURPOS SPDT 50MA 24VDC	119
2941439 Phoenix Contact	RELAY GEN PUR DPDT 50MA 24VAC/DC	58
2903345 Phoenix Contact	RELAY GEN PURPOS DPDT 50MA 24VAC	250

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.