ABB CR-M024DC4L Pluggable Interface Relay

Description

• CR-M024DC4L decoding​ (ABB CR-M naming):
  • CR-M​ = CR series, M​ = Miniature pluggable interface relay (vs CR-P​ = slightly larger, 10A/contacts; CR-S​ = slim 6.2mm width; CR-M is the “standard compact 4CO” workhorse)
  • 024DC​ = Coil voltage 24V DC​ (other variants: 012DC=12V DC, 048DC=48V DC, 110=110V AC, 230=230V AC, etc.)
  • 4L​ = 4 CO (4 changeover contacts, 4PDT), L​ = “Standard” leaf (vs “4” alone sometimes, but ABB: 4L specifically = 4CO, 6A, AgNi contact material, screw/socket agnostic — the “L” is just the CR-M base model code; there’s also 2L = 2CO version in CR-M? Actually CR-M only comes in 4CO — the “4L” is the stock keeping. Some docs show CR-Mxx4L = 4CO, 6A)
  • 1SVR405613R1100​ = ABB’s full 8+3-digit material number — this is the global unique ID; CR-M024DC4L is the short/human-readable. For ordering/spare matching, use 1SVR405613R1100​ — it’s unambiguous (short code can collide across regions).

⚠️ Critical: CR-M024DC4L is the RELAY BODY ONLY​ — it cannot mount to DIN rail by itself. It MUST plug into an ABB CR-M socket:

• CR-M2_​ = Socket with screw terminals​ (e.g., CR-M220 = 2CO socket? Wait — CR-M socket naming: CR-M20​ = socket for CR-M, screw term, no indicator; CR-M21​ = with LED + test button; CR-M22​ = with LED + test button + diode suppression; CR-M23​ = with LED + test button + RC suppression. Actually ABB CR-M socket codes: CR-M2 0 / 1 / 2 / 3 / 4 / 5 variants — 0=basic, 1=LED, 2=LED+diode, 3=LED+RC, 4=LED+varistor, 5=LED+diode+RC etc. Check ABB CR-M catalog.)
• CR-M4_​ = Same socket functions but spring (cage clamp) terminals​ instead of screw (for vibration-heavy env: rail, marine, packaging)
• CR-M_RS​ = “Relay + Socket” pre-assembled kit (e.g., CR-M_RS024DC4L = relay + socket + LED + test button bundled) — if you want “one SKU = ready to DIN-mount”, order the CR-M_RS…​ kit instead of bare CR-M024DC4L + separate socket.

Common buyer mistake: Orders “CR-M024DC4L” thinking it’s DIN-ready, receives a tiny relay body (about 27×21×35mm), realizes no socket/no DIN clip, has to re-order. If you need DIN-ready, ask for CR-M_RS024DC4L (kit) or order CR-M024DC4L + CR-M2/CR-M4socket separately.

• Why 4CO (4PDT) matters: Most interface relays are 2CO (Finder 40.52, Omron MY2, etc. — 2PDT, 8-10A). CR-M is 4CO in the same 21mm width​ — so you get 4 independent switch circuits​ (or 2× DPDT, or mix NO/NC) in one compact body. Example: PLC DO → CR-M024DC4L → Contact 1=main pump contactor, Contact 2=backup pump contactor, Contact 3=alarm horn, Contact 4=pilot lamp. One CR-M replaces two 2CO relays = saves DIN space. But trade-off: 6A rating​ (vs 8-10A on 2CO relays) — CR-M sacrifices ampacity for extra poles in same width. If you need >6A per pole, go CR-P (10A) or Finder 60.12 (12A 2CO) — but those are 2CO only.
• 24V DC coil — freewheeling note: When switching a DC coil OFF, the collapsing magnetic field generates a voltage spike (V = L·di/dt) that can damage PLC transistor outputs. Solution: Either (a) use a CR-M socket with built-in flywheel diode​ (CR-M22​ socket = LED + test button + diode — part number like CR-M220? Wait need exact: ABB CR-M2 series — CR-M20 = plain socket screw; CR-M21 = +LED; CR-M22 = +LED+diode; CR-M23 = +LED+RC; CR-M24 = +LED+varistor; CR-M25 = +LED+diode+RC). Or (b) add external 1N4007 flywheel diode​ across coil A1/A2 (reverse-biased, cathode to +24V side). If you use AC coil (110/230V) → RC snubber or varistor preferred (CR-M23/CR-M24 sockets have those).

Key Features

• Relay Type: CR-M miniature pluggable interface relay (4PDT / 4c/o)
• Coil: 24V DC (CR-M024…), power consumption ~ 0.5–0.8W (check ABB: CR-M 24V DC coil ~0.6W)
• Contacts: 4× CO (changeover / SPDT ×4 = 4PDT), 6A @ 250V AC​ (resistive), 6A @ 30V DC​ — AgNi contact material (silver-nickel, good for general purpose, not for high-inductive without suppression)
• Rating Detail: AC-15: 6A @ 250V; DC-13: 6A @ 30V (IEC 60947-5-1)
• Mechanical Life: 30 million operations (no load); Electrical life: 100,000 ops @ 6A 250V AC resistive
• Body Dimensions: ~ 27.5 mm(W) × 21 mm(D) × 35 mm(H) — plugs into CR-M socket (socket adds ~15mm depth + DIN clip)
• Socket Options (CR-M2/CR-M4): Screw (M2) or Spring (M4); variants: plain / +LED / +LED+diode / +LED+RC / +LED+varistor / +LED+diode+RC
• Test Button: On socket variants with “1” and above — manual push to force relay ON (for commissioning / troubleshooting — verify contactor pulls without PLC DO active)
• Mechanical Flag (Indicator): On coil side (some variants) or via LED on socket — shows coil energized state
• Country of Origin: Germany / Poland / China (ABB)

Technical Specifications (CR-M024DC4L / 1SVR405613R1100 — 4CO, 6A, 24V DC)

⚠️ Socket Selection Quick Table (CR-M2_ screw / CR-M4_ spring):

Socket Code	LED	Test Btn	Coil Suppression	Best For
CR-M20 / M40	❌	❌	None	Cost-down, AC coil OK, no diag needed
CR-M21 / M41	✅	✅	None	DC coil + external diode, want LED+test
CR-M22 / M42	✅	✅	Flywheel diode​ (DC coil)	24V DC coil — recommended​ (diode built-in, protects PLC)
CR-M23 / M43	✅	✅	RC snubber​	AC coil (110/230V) — suppresses contact arc + coil spike
CR-M24 / M44	✅	✅	Varistor​	AC coil, compact suppression
CR-M25 / M45	✅	✅	Diode + RC	DC+AC mixed panel, deluxe

For your CR-M024DC4L (24V DC coil)​ → CR-M22​ (screw) or CR-M42​ (spring) is the smart socket — built-in flywheel diode protects PLC transistor DO without external diode wiring.

Warranty & After-Sales

• Factory new units: 12 months warranty
• Refurbished units: 3-6 months warranty (coil 24V DC power-up → hear click → multimeter 4× CO continuity check NO/NC → verify release)
• Technical support for:
  • Relay-only vs RS-kit vs socket-separate: CR-M024DC4L = relay body only (no socket, no DIN); CR-M_RS024DC4L​ = kit (relay + socket + LED + test btn) DIN-ready; OR buy CR-M024DC4L + CR-M2/CR-M4socket sep. → recommend RS-kit for new install, bare relay for spare (you already have sockets in panel)
  • Socket selection for 24V DC coil: CR-M22 (screw + LED + diode) or CR-M42 (spring + LED + diode) — built-in flywheel diode saves external 1N4007, protects PLC DO. If budget tight + you add external diode → CR-M21 plain LED+test is ok.
  • 4CO wiring: 14 pins on relay base (4× CO = 4×(COM+NO+NC) = 12 + A1+A2 coil = 14 pins) — maps to socket screw terminals (CR-M2_ has 14 screw terminals labeled A1,A2,11-14,21-24,31-34,41-44 typically — check ABB terminal diagram: 1st CO = 11(COM),12(NO),14(NC); 2nd=21,22,24; 3rd=31,32,34; 4th=41,42,44; A1/A2 coil). We can provide terminal map.
  • PLC DO sizing check: CR-M 24V DC coil draws ~25mA — any PLC transistor DO (0.5A) or relay DO (2A) handles it easily. But if driving 20+ CR-M on one PLC DO (via interposing) → sum coil current matters.
  • Replacement cross: If migrating from Finder 40.61 (6A 1CO? No Finder 40.51=5A 1CO, 40.52=8A 2CO, 40.61=6A 1CO) — CR-M is 4CO unique; if you need 2CO 8A, CR-M is under-specced → go CR-P (10A 2CO) or Finder 40.52. If you need 4CO compact, CR-M has few peers (Om also makes 4CO 6A slim relays, Phoenix PLC-RSC_4CO).
  • Full p/n usage: 1SVR405613R1100 is the ABB global ID — use this for spare matching / cross-plant ordering to avoid regional short-code confusion.
• Optional: CR-M socket (CR-M22_ screw / CR-M42_ spring), CR-M_RS024DC4L kit (relay+socket+LED+test pre-assembled), DIN-jumper links (for common A1/A2 across multiple CR-M on same DIN row), external flywheel diode (1N4007) if using plain socket

Delivery Time

• Standard delivery: 3-5 working days (stock NOS)
• Express shipping available upon request

Why Choose Our Store

• Genuine ABB CR-M series — not gray-market (AgNi contact rating & coil insulation critical for PLC DO protection — clones fail contact resistance after 10k ops)
• Global supply network with competitive pricing on ABB CR-M/CR-P/CR-S interface relays + sockets
• Expertise in CR-M system (relay-only vs RS-kit, socket CR-M22/23/24 selection for DC/AC coil, 4CO terminal map, PLC DO flywheel diode protection, 1SVR full p/n cross-matching)
• Comprehensive technical documentation (CR-M024DC4L terminal layout, CR-M2_ socket variant table, 4CO wiring diagram A1/A2+11-44, PLC DO coil current calc)
• Responsive customer service and support

Applications

• PLC DO Buffer / Amplifier (most common): S7-1200/1500 DO (0.5A transistor) or S7-300 SM322 DO (2A relay) → CR-M024DC4L coil (25mA load, trivial for PLC) → 4× CO contacts each 6A 250V AC → switch contactors (AC coil 250V), solenoid valves (24V DC 4A), indicator lamps, alarm horns, stack lights. One CR-M = 4 independent loads switched from 1 PLC DO (or from 4 PLC DOs — 4CO maps 4 separate PLC points to 4 field loads). The 4CO density is the sell — 2× 2CO relays would take 2× width; CR-M does 4CO in 1 body (~28mm W including socket ~35mm total).
• Signal Isolation / Voltage Translation: PLC 24V DC side ↔ field 120V AC or 230V AC side — CR-M gives galvanic isolation (coil vs contact dielectric). Useful when field has different ground/noise vs PLC cabinet.
• Spare / Cascade Strategy: CR-M body is universal across all CR-M sockets — stock 5× CR-M024DC4L bare relays as cold spare for entire plant (regardless of whether plant uses screw or spring sockets — relay body fits both CR-M2_ and CR-M4). Sockets (CR-M22) stock separately. Much cheaper than stocking brand-specific Finder/Omron relays (Finder 40.52 ≠ ABB CR-M, not interchangeable — different pin map).
• Control Panel Retrofit (Finder / Omron MY / Siemens 3RH):
  • Finder 40.52 (8A 2CO) → if you need 4CO, CR-M024DC4L is the swap (but 6A vs 8A — check load)
  • Omron MY4 (4CO, 5A 250V AC) → CR-M is near-drop: 6A vs 5A, same 4CO, ABB vs Omron pinout DIFFERENT (MY4 = 14-pin base, CR-M = 14-pin but A1/A2 + CO numbering differs — not pin-compatible!​ Cannot drop CR-M into MY4 socket. Must replace socket too.)
  • Siemens 3RH (contact relay, not interface — 3RH is true contactor-relay, bulkier) → CR-M is smaller, for signal-level not power-level.