Omron D4BL-2CRA — Safety Device
SKU: D4BL-2CRAUSD 135.00
Die-cast aluminum guard-lock safety-door switch with mechanical lock and 24 VDC solenoid release (power-to-unlock), G1/2 conduit, 1NC/1NO + 1NC lock monitor, IP67, EN ISO 13849-1 / TÜV approved, 700 N holding force.
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Product Overview
The D4BL-2CRA is a heavy-duty guard-lock safety-door switch from Omron's D4BL family, designed for industrial environments where plastic-body switches would fail. It uses a die-cast aluminum housing (vs the plastic D4NL and D4NS) with IP67 protection, which makes it suitable for machine-tool cells, foundry equipment, food-processing washdown zones, and outdoor installations. Holding force is 700 N minimum — lower than the D4NL's 1,300 N, but the D4BL's heavier construction provides better impact resistance. The "power to unlock" logic means the mechanical lock is applied automatically when the operation key (D4DS-K1, K2, K3, or K5) inserts into the switch head, and the lock is only released when 24 VDC is applied to the solenoid.
Decoding the D4BL-2CRA model suffix
The model suffix encodes four decisions: conduit size, contact arrangement, head direction, lock logic. 1 = PG13.5 conduit (European standard), 2 = G1/2 conduit (Japanese / UK / IEC standard, this SKU), 3 = 1/2-14NPT (North American standard), 4 = M20 (IEC standard). C = 1NC/1NO (slow-action) for the door-open/closed detection switch + 1NC (slow-action) for the lock-monitor switch; D = 2NC (slow-action) + 1NC (slow-action lock monitor). R = 4-direction head (key can be inserted from any of 4 horizontal directions).
How the D4BL compares to the D4NL
Both D4BL and D4NL are guard-lock safety-door switches with solenoid lock and slow-action contacts, but they differ in three key ways. First, housing: D4BL is die-cast aluminum (rugged, IP67, 700 N holding force); D4NL is plastic resin (lighter, IP67, 1,300 N holding force). Second, contact options: D4NL offers 4-contact (1NC/1NO+2NC, 2NC+1NC/1NO) and 5-contact (2NC+2NC, 1NC/1NO+2NC+1NO) variants in addition to the 3-contact (1NC/1NO+1NC) sets; D4BL is mostly 3-contact and 2NC+1NC. Third, dimensions: D4BL is wider and heavier (~810 g) than the D4NL (~280 g), so it requires more panel space.
Installation and wiring notes
The D4BL-2CRA has two G1/2 conduit openings — one for incoming power, one for the outgoing contact wiring — allowing the wire to enter and exit on opposite sides of the switch for clean panel layout. Inside the housing is a removable contact block with M3.5 screw terminals; the contact block can be removed for wiring without disturbing the switch head or operation key insertion. Wire the 24 VDC solenoid to a safe-output (either a safety relay's output contact or a safety controller's output).
Key Features
- Die-cast aluminum housing for impact resistance and outdoor use
- Power-to-unlock logic for safe-fail behaviour
- 700 N minimum holding force
- 1NC/1NO door-detection + 1NC lock-monitor contacts
- G1/2 conduit, 2-conduit wiring chamber for clean panel layout
- IP67 degree of protection
- EN ISO 13849-1 / EN 60947-5-1 / TÜV / UL / CSA / BIA / SUVA certified
- 4-direction head
- SKU: D4BL-2CRA
- Series: D4BL (Guard-Lock Safety-Door Switch, metal body)
- Voltage: 24 VDC
Best-Fit Applications
- Guard-door interlock on a machining-centre enclosure where metal chips and coolant are present
- Safety-door interlock on a foundry cell or heavy-industrial press with high impact risk
- Outdoor equipment cabinet door interlock on a water-treatment skid
- Guard-door interlock on a heavy-material conveyor where plastic-body switches would be damaged
Buying Checklist
- Pick D4BL-2CRA for G1/2 conduit, 24 VDC power-to-unlock, 1NC/1NO+1NC contacts
- Pick D4BL-1CRA for PG13.5 conduit; D4BL-4CRA for M20 conduit
- Pick D4BL-2DRA if you need 2NC+1NC contact arrangement
- Pick D4BL-2CRG if you need power-to-lock logic instead of power-to-unlock
- Pick D4BL-2CRA-A if you need an LED indicator
- Pair with D4DS-K1 or D4DS-K2 operation keys — ordered separately
Technical Specifications
| Model | D4BL-2CRA |
|---|---|
| Series | D4BL (Guard-Lock Safety-Door Switch, metal body) |
| Type | Key-operated, solenoid-locked guard-door switch |
| Housing Material | Die-cast aluminum |
| Head Material | Plastic (resin) |
| Conduit Size | G1/2 (2-conduit) |
| Conduit Outlet | Horizontal + vertical |
| Built-in Switch | 1NC/1NO (slow-action) + 1NC (slow-action, lock monitor) |
| Solenoid Voltage | 24 VDC |
| Operating Temperature | -10 to +55 °C |
| Rated Current | 10 A |
| Dimensions (H × W × D) | 123.5 × 112 × 46.3 mm |
| Certifications | EN ISO 13849-1, EN 60947-5-1, TÜV, UL, CSA, BIA, SUVA, CE |
Resources & Downloads
FAQ for D4BL-2CRA
What's the difference between the D4BL and the D4NL?
Both are guard-lock safety-door switches with solenoid lock and slow-action contacts. D4BL is die-cast aluminum (heavier, more rugged, 700 N holding force); D4NL is plastic resin (lighter, 1,300 N holding force, more contact variants). Pick D4BL when you need impact resistance, outdoor rating, or metal housing. Pick D4NL when you need higher holding force or more contact flexibility. Both accept the same D4DS-K1/K2/K3/K5 operation keys.
What does "power to unlock" mean on the D4BL-2CRA?
The mechanical lock engages automatically when the operation key inserts into the switch head. The lock is only released when 24 VDC is applied to the solenoid. If power is lost (E-stop, cable break, brownout), the door stays locked and the operator cannot enter the hazard zone until power is restored and the safety controller deliberately releases the lock.
What operation key do I need with the D4BL-2CRA?
A D4DS-series key, ordered separately. Pick D4DS-K1 for horizontal mounting (key slides in from the side), D4DS-K2 for vertical mounting (key inserts from above or below, this SKU's typical pairing), D4DS-K3 for adjustable horizontal mounting, or D4DS-K5 for fully adjustable mounting. The switch itself does not include the key; it must be ordered separately and bolted to the door with the supplied one-way screws.
What's the holding force of the D4BL-2CRA?
700 N minimum. This is the force the locked switch can withstand before the operation key is forced out of the switch head. For higher holding force (1,300 N), use the D4NL family instead. 700 N is sufficient for most machine-guard doors; heavy industrial cells with thick steel doors and frequent operator impact may require the higher-force D4NL.
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