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D44L-R1MD Equivalent & Substitute Parts
Part Overview
The D44L-R1MD is a snap action SPDT switch manufactured by ZF Electronics, designed for chassis mount applications with quick connect termination. This switch is rated for 10A AC at 125V and 6A DC at 30V, featuring a straight lever actuator and explosion-proof design. The product is currently obsolete, making identification of compatible substitute parts essential for maintenance, repair, and system continuity in applications where this component was originally specified.
Substiute Parts
Key Parameters
| Parameter | Value |
|---|---|
| Manufacturer Part Number | D44L-R1MD |
| Manufacturer | ZF Electronics |
| Series | D4 |
| Circuit Configuration | SPDT |
| Switch Function | On-Momentary |
| Current Rating (AC) | 10A |
| Current Rating (DC) | 6A |
| Voltage Rating (AC) | 125V |
| Voltage Rating (DC) | 30V |
| Actuator Type | Lever, Straight |
| Mounting Type | Chassis Mount |
| Termination Style | Quick Connect - 0.187" (4.7mm) |
| Operating Force | 25gf |
| Operating Temperature Range | -40°C to 85°C |
| Electrical Life | 6,000 Cycles |
| RoHS Status | ROHS3 Compliant |
| Product Status | Obsolete |
Substitute Part Grouping Explanation
The D449-R1MD-G2 qualifies as a direct substitute based on the following alignment of critical parameters:
Maintained Compatibility Parameters:
- Circuit configuration: SPDT (identical)
- Switch function: On-Momentary (identical)
- Actuator type: Lever, Straight (identical)
- Mounting type: Chassis Mount (identical)
- Termination style: Quick Connect - 0.187" (4.7mm) (identical)
- Operating force: 25gf (identical)
- Operating temperature range: -40°C to 85°C (identical)
- Series: D4 (identical)
- RoHS compliance: ROHS3 Compliant (identical)
Enhanced Specifications in Substitute:
- AC current rating: 10A (maintained)
- AC voltage rating: 250V (increased from 125V)
- Electrical life: 50,000 cycles (increased from 6,000 cycles)
- Product status: Active (versus obsolete)
The D449-R1MD-G2 operates within the same mechanical and electrical envelope while providing superior voltage and cycle life ratings, making it suitable for direct replacement in applications originally designed for the D44L-R1MD.
Parameter Comparison
| Parameter | D44L-R1MD (Main Part) | D449-R1MD-G2 (Substitute) |
|---|---|---|
| Manufacturer | ZF Electronics | ZF Electronics |
| Series | D4 | D4 |
| Circuit Configuration | SPDT | SPDT |
| Switch Function | On-Momentary | On-Momentary |
| Current Rating (AC) | 10A | 10A |
| Voltage Rating (AC) | 125V | 250V |
| Actuator Type | Lever, Straight | Lever, Straight |
| Mounting Type | Chassis Mount | Chassis Mount |
| Termination Style | Quick Connect - 0.187" (4.7mm) | Quick Connect - 0.187" (4.7mm) |
| Operating Force | 25gf | 25gf |
| Operating Temperature Range | -40°C to 85°C | -40°C to 85°C |
| Electrical Life | 6,000 Cycles | 50,000 Cycles |
| RoHS Status | ROHS3 Compliant | ROHS3 Compliant |
| Product Status | Obsolete | Active |
Engineering Selection Recommendations
The D449-R1MD-G2 is the appropriate substitute for the obsolete D44L-R1MD. Both components maintain identical mechanical interfaces, electrical circuit topology, and operational characteristics. The substitute part offers enhanced performance specifications with increased AC voltage rating (250V versus 125V) and extended electrical life (50,000 cycles versus 6,000 cycles), providing improved reliability margins in replacement applications.
The D449-R1MD-G2 carries active product status with current manufacturing support, ensuring availability for procurement and future maintenance requirements. Both parts maintain equivalent RoHS3 compliance and operate across the same temperature range, supporting direct integration into existing designs without circuit modification.
Frequently Asked Questions (FAQ)
Q: Can the D449-R1MD-G2 directly replace the D44L-R1MD in existing applications?
A: Yes. Both parts share identical SPDT circuit configuration, on-momentary switch function, lever actuator geometry, chassis mount interface, and quick connect termination. Mechanical and electrical interfaces are fully compatible.
Q: What are the key differences between these parts?
A: The D449-R1MD-G2 provides higher AC voltage rating (250V versus 125V) and significantly extended electrical life (50,000 cycles versus 6,000 cycles). The substitute part is currently in active production, whereas the D44L-R1MD is obsolete.
Q: Are there any voltage or current derating considerations?
A: The D44L-R1MD operates at 10A AC / 125V AC or 6A DC / 30V DC. The D449-R1MD-G2 operates at 10A AC / 250V AC. Applications operating within the original D44L-R1MD voltage and current specifications will operate safely with the substitute part.
Q: Do both parts use the same termination method?
A: Yes. Both parts use Quick Connect - 0.187" (4.7mm) termination, ensuring compatibility with existing harness and connector assemblies.
Q: What is the packaging difference?
A: The D44L-R1MD is supplied in standard packaging, while the D449-R1MD-G2 is supplied in bulk packaging. This does not affect component functionality or performance.
Q: Are both parts RoHS compliant?
A: Yes. Both the D44L-R1MD and D449-R1MD-G2 are ROHS3 compliant, meeting current environmental and regulatory requirements.
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