Description
The Phoenix Contact PLC-RSC-24DC/21 is a plug-in electromechanical relay module with a 24 V DC coil, designed to interface PLC digital outputs with higher-current or AC loads. It consists of the relay “plug” (PLC-RSC-24DC/21) which clicks into the corresponding PLC-BSC-24DC/21 base (or older -BT base). The base provides screw or spring-cage terminals for field wiring and a fixed backplane pin header (21 pins) that plugs into a PLC I/O card or interface patch panel. This separation allows relay replacement without disturbing field wiring — a key advantage in maintenance.
Key Features
- Coil Voltage: 24 V DC (RSC = Relais Stecksystem Compact)
- Contact Rating: 6 A @ 250 V AC / 30 V DC (SPDT — 1 CO contact / Form C)
- Status Indication: LED for coil energized + mechanical flag
- Interchangeable: Relay pull-out — base stays wired
- Base Type: PLC-BSC-24DC/21 (screw terminals) or PLC-BSC…/21 variants (spring-cage available)
- Country of Origin: Germany
Typical Variants in This Family
Model | Description |
|---|---|
PLC-RSC-24DC/21 | Relay plug, 24V DC coil, 1 CO contact, 21-pin header pattern |
PLC-BSC-24DC/21 | Base with screw terminals, 24V DC version (no diode on coil — RSC plug has it) |
Alternative | PLC-RSC-230UC/21 (230V AC/DC coil), PLC-BSP-24DC/21 (spring-cage base) |
Technical Specifications
Parameter | Specification |
|---|---|
Relay Plug Model | PLC-RSC-24DC/21 (Order No. 2966173 typical) |
Base Model | PLC-BSC-24DC/21 (Order No. 2966027 typical) |
Coil Voltage (Nom.) | 24 V DC (Operational range 19.2–30 V DC) |
Pick-up/Drop-out Voltage | Typ. ≤ 18 V / ≥ 2 V |
Coil Power Consumption | ~ 0.36 W (LED + coil) |
Contact Type | 1 changeover (CO / Form C): NO + NC |
Contact Rating (Resistive) | 6 A @ 250 V AC, 6 A @ 30 V DC |
Min. Switching Current/Voltage | 10 mA / 5 V (gold-plated contacts — avoid dry-circuit <10mV/µA) |
Mechanical Life | > 10⁷ operations |
Electrical Life | > 10⁵ ops @ rated load |
Response Time (Operate/Release) | ≤ 8 ms / ≤ 5 ms |
Isolation (Coil–Contact) | 4 kV impulse (basic insulation) |
Mounting | 35 mm DIN rail (base unit) |
Connection (Field Side) | Screw terminals (BSC) or Spring (BSP variant) |
Dimensions (Base W×H×D) | 6.2 mm × 80 mm × 94 mm (per module) |
Weight | ~ 30 g (plug + base) |
Standards | IEC 61810-1, UL 508, CSA, CE, RoHS |
💡 Wiring Tip: The PLC-BSC base typically has terminals labeled A1/A2 (coil — connected to RSC plug’s coil pins), 15-16-14 (CO contact: 15-Common, 16-NO, 14-NC). Use A1 (+) and A2 (-) for 24V DC coil. Polarity matters for DC coil!
Warranty & After-Sales
- Factory new units: 12 months warranty
- Refurbished units: 3-6 months warranty (where offered)
- Technical support for:
- Correct base selection (screw BSC vs spring BSP vs BT old style)
- Interposing relay sizing (when to use 6A vs heavier contactor)
- Flyback diode / RC snubber need (RSC plug already has diode across coil)
- Cross-reference to Finder / Omron G2R-1-SN + P2RF-05-E + socket equivalents
- Wiring diagram & pinout provided
Delivery Time
- Standard delivery: 3-5 working days (stock items)
- Express shipping available upon request
Why Choose Our Store
- Genuine Phoenix Contact interface modules & relays
- Global supply network with competitive pricing
- Expertise in PLC I/O interfacing, interposing relays & signal conditioning
- Comprehensive technical documentation (datasheets, dimension drawings, GSD)
- Responsive customer service and support
Applications
- PLC digital output (DO) interposing — protects PLC DO card from inductive load spikes
- Switching 24V DC or 120/230V AC loads (solenoids, contactors, indicator beacons)
- Signal isolation between control voltage (24V DC) and field voltage (AC or higher DC)
- Retrofit of hard-wired relay panels with modular DIN-mount relays
- Machine status annunciation (via NO/NC contacts driving stack lights, horns)
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