Phoenix Contact PLC-RSC-24DC-21-EX Relay Module

Technical Overview

DIN-rail-mountable 6.2mm relay module with 24V DC input, 6A SPDT contact, and ATEX/IECEx Zone 2, Class I, Div. 2 hazardous location approvals.

Key Features

Compact 6.2 mm interface module design saves panel space.
DIN-rail mountable basic terminal block with robust screw connections for easy installation.
Plug-in miniature relay with a 6 A power contact for efficient switching performance.
Features 1 changeover (SPDT) contact for versatile control and signal routing.
Operates with a standard 24 V DC input voltage for compatibility with automation systems.
Equipped with Silver-Tin Oxide (AgSnO) contacts for reliable switching and durability.
Low power dissipation of 0.22 W ensures energy efficiency.

Technical Specification Matrix

Parameter	Value
Nominal Input Voltage U_N	24 V DC
Input Voltage Range	18.5 V DC ... 33.6 V DC (20 °C)
Typical Input Current at U_N	9 mA
Maximum Switching Voltage	250 V AC/DC
Limiting Continuous Current	6 A
Contact Type	1 changeover contact (SPDT / 1 Form C)
Contact Material	AgSnO (Silver-Tin Oxide)
Mounting Type	DIN Rail Mount
Connection Type	Screw Connection
Degree of Protection	IP20 (Relay base), RT III (Relay)
Hazardous Location Approvals	ATEX/IECEx (Zone 2), Ex Zone Class I, Div. 2
Ambient Temperature (Operation)	-40 °C ... 60 °C (ATEX / IECEx)
Typical Response Time	5 ms
Typical Release Time	8 ms
Power Dissipation (Nominal Condition)	0.22 W
Mechanical Service Life	2 x 10^7 cycles
Physical Weight (kg)	0.04
Dimensions L x W x H (cm)	9.4 x 0.62 x 8

Industrial Applications

1. Process Control in Hazardous Chemical Facilities

This relay module is ideal for controlling critical signals in chemical plants where flammable gases or vapors may be present. Its ATEX/IECEx Zone 2 and Class I, Div. 2 certifications ensure safe operation in these hazardous environments, enabling reliable control of solenoid valves or process indicators from a 24V DC control system.

Problem Solved

Ensures safe and reliable signal switching and electrical isolation in areas with potential explosive atmospheres.

ATEXIECEx Zone 2Class I, Div. 224V DC controlSignal isolation

2. Safety Interlocking in Pharmaceutical Manufacturing

In pharmaceutical production lines handling solvents, the module provides crucial safety interlocking for machinery. Its hazardous area approvals (ATEX/IECEx Zone 2) facilitate compliance and safe integration, while the 6A switching capacity and 1 changeover contact enable robust control logic for equipment shutdown or status feedback, protecting both personnel and product.

Problem Solved

Provides certified safe signal handling and interlocking for equipment in pharmaceutical environments with flammable substances.

Hazardous areaSafety interlocking6A switchingSPDT contactElectrical isolation

3. Remote I/O and Control in Wastewater Treatment Plants

For distributed control systems in wastewater treatment, this module can be used in remote I/O panels for controlling pumps, valves, or activating alarms. The DIN-rail mounting and screw connections simplify installation and maintenance, and its hazardous location ratings (ATEX/IECEx Zone 2) address potential methane gas presence in certain areas, enhancing overall plant safety and reliability.

Problem Solved

Offers a compact, reliable, and safely certified solution for remote control and signal integration in challenging wastewater environments.

DIN-rail mountingScrew connection24V DC inputATEX/IECEx Zone 2Wastewater automation