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Specification & Description
| Specification | Description |
|---|---|
| Part Number | D4BL-4DRA-A |
| Alternative Part Number | D4BL4DRAA |
| Part Manufacturer | Omron |
| Part Category | Safety Interlock Switch |
| Conduit Outlet | M20 |
| Voltage for Solenoid | 24 VDC |
| Contact Configuration | 2NC (slow-action) + 1NC (slow-action) |
| Indicator | Equipped with an orange/green LED display unit |
| Degree of Protection | IP67 (EN60947-5-1) |
| Mechanical Durability | 1,000,000 operations min. |
| Electrical Durability | 500,000 operations min. (10 A resistive load at 250 VAC) |
| Operating Speed | 0.05 to 0.5 m/s |
| Operating Frequency | 30 operations/minute max. |
| Direct Opening Force | 19.61 N min. (EN60947-5-1) |
| Direct Opening Travel | 20 mm min. (EN60947-5-1) |
| Holding Force | 700 N min. (GS-ET-19) |
| Contact Resistance | 50 mΩ max. |
| Rated Insulation Voltage (Ui) | 300 V (EN60947-5-1) |
| Ambient Operating Temperature | –10 to 55°C (with no icing) |
| Ambient Operating Humidity | 95% max. |
| Weight | Approx. 800 g |
| Solenoid Coil Characteristics | 24 VDC models with approx. 300 mA current consumption and Class B insulation (130°C or less) |
| Indicator Characteristics | 10 to 115 VAC/VDC with approx. 1 mA current leakage, featuring orange and green LEDs |
| Head Mounting Direction | Four mounting directions possible |
| Door Lock and Release | Mechanical lock with 24 VDC solenoid release |
| Operation Key Types | Horizontal mounting (D4BL-K1), Vertical mounting (D4BL-K2), Adjustable mounting (Horizontal) (D4BL-K3) |
The Omron D4BL-4DRA-A Safety Interlock Switch is a robust and reliable component designed to enhance the safety of industrial machinery. This switch is engineered to keep protective doors closed until machinery has completely stopped, ensuring a high level of safety for operators. It features a mechanical lock that is automatically applied when the operation key is inserted and can only be released when voltage is applied to the solenoid, providing a controlled and secure environment for maintenance or emergency situations.
Constructed with a durable aluminium die-cast body, the D4BL-4DRA-A is enclosed in a switch box that meets IP67 standards, making it resistant to dust and water ingress, and suitable for use in harsh industrial settings. The switch also boasts a direct opening mechanism for its NC contacts, which is certified to EN standards, ensuring that it will reliably break the circuit when the protective cover is opened.
For added versatility, the D4BL-4DRA-A comes equipped with both horizontal and vertical conduit entries, making installation and wiring straightforward. It also offers the convenience of an adjustable operation key for swinging doors and the ability to change the mounting direction of the head, allowing for four different key insertion directions to suit various door configurations.
The Omron D4BL-4DRA-A is a safety interlock switch that not only provides peace of mind through its certified safety features but also offers the flexibility and durability needed for consistent operation in the demanding world of industrial automation.
Commonly Asked Questions
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Frequently Asked Questions
What is the function of the Safety Interlock Switch?
The Safety Interlock Switch is designed to ensure that machine guards or safety doors are in place and properly closed before machinery can be operated. It provides a high level of safety by locking the protective doors and only releasing them when the correct conditions are met, such as when voltage is applied to the solenoid.
Can the head of the switch be mounted in different directions?
Yes, the head of the switch can be changed to allow the operation key to be inserted from four different directions, providing flexibility in mounting and ease of integration into various machine designs.
What type of protection does the switch offer against dust and water?
The switch is housed in a tough aluminium die-cast body with a degree of protection satisfying IP67, meaning it is protected against dust and temporary immersion in water, making it suitable for use in harsh industrial environments.
How can I confirm if the protective door is locked or unlocked?
Models with indicator units can be used to confirm the locked or unlocked status of the protective door. The indicators can show the open/closed status of the door, the ON/OFF status of the power supply, and the ON/OFF status of the solenoid.
What should be done in case of a power failure to release the lock?
The switch comes with an auxiliary release key that can be used to manually unlock the door in the event of a power failure, ensuring maintenance personnel can safely access the machinery.
Is the switch certified to any safety standards?
Yes, the switch conforms to EN (TÜV) standards corresponding to the CE marking and is also certified by UL, CSA, and CCC standards, ensuring compliance with international safety regulations.
What is the importance of the direct opening mechanism in this switch?
The direct opening mechanism is a safety feature that ensures the contacts of the switch will open directly in the event of a protective cover being opened. This mechanism is EN-certified and is indicated by a special mark on the switch.
How is the solenoid of the switch powered and what should be considered during wiring?
The solenoid operates at 24 VDC and it's important to confirm the polarity before wiring, as the solenoid terminals are polarity sensitive. Proper connection is crucial for the correct operation of the switch.
What are the operating and reset forces for the Safety Interlock Switch?
The operating and reset forces for the switch are both a maximum of 19.61 N, ensuring reliable operation and reset actions for the safety mechanism.
Can the switch be used outdoors or in environments with potential chemical contamination?
While the switch has a robust IP67 rating, it is not recommended for use in environments where it can be continuously exposed to harsh chemicals or extreme weather conditions. It's best to assess the suitability of the switch for such environments on a case-by-case basis.
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