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RT3S-24V Equivalent & Substitute Parts
Part Overview
The RT3S-24V is a general purpose relay manufactured by Panasonic Industrial Automation Sales, configured as a SPST-NO (1 Form A) x 4 with a 24VDC coil. This relay is designed for DIN rail mounting and provides switching capability for 250VAC and 30VDC maximum loads at 3A contact rating. The product is currently obsolete, making identification of compatible substitute parts essential for system maintenance and component replacement in existing installations.
Substiute Parts
Key Parameters
| Parameter | Value |
|---|---|
| Coil Voltage | 24VDC |
| Contact Form | SPST-NO (1 Form A) x 4 |
| Contact Rating (Current) | 3 A |
| Switching Voltage | 250VAC, 30VDC - Max |
| Mounting Type | DIN Rail |
| Coil Type | Non Latching |
| Termination Style | Screw Terminal |
| Operating Temperature Range | -20°C ~ 55°C |
| Must Operate Voltage | 16.8 VDC |
| Must Release Voltage | 1.2 VDC |
Substitute Part Grouping Explanation
Substitution of the RT3S-24V is determined by electrical and mechanical compatibility across the following critical parameters:
- Coil Voltage: Must be 24VDC to match control circuit requirements
- Contact Configuration: Must be SPST-NO (1 Form A) x 4 to maintain circuit topology
- Contact Rating: Must support minimum 3A at 250VAC and 30VDC switching
- Mounting Interface: Must be DIN rail compatible for installation in existing enclosures
- Coil Type: Must be non-latching for standard relay operation
- Termination: Must use screw terminal connections for existing wiring
- Operating Temperature: Must support -20°C to 55°C range for environmental compatibility
- Voltage Thresholds: Must operate at 16.8 VDC minimum and release at 1.2 VDC maximum
The RT3SN-24V meets all substitution criteria and is classified as a direct equivalent.
Parameter Comparison
| Parameter | RT3S-24V (Main Part) | RT3SN-24V (Substitute) |
|---|---|---|
| Manufacturer | Panasonic Industrial Automation Sales | Panasonic Electric Works |
| Product Status | Obsolete | Active |
| Series | RT-3 | RT-3 |
| Coil Voltage | 24VDC | 24VDC |
| Contact Form | SPST-NO (1 Form A) x 4 | SPST-NO (1 Form A) x 4 |
| Contact Rating (Current) | 3 A | 3 A |
| Switching Voltage | 250VAC, 30VDC - Max | 250VAC, 30VDC - Max |
| Mounting Type | DIN Rail | DIN Rail |
| Coil Type | Non Latching | Non Latching |
| Termination Style | Screw Terminal | Screw Terminal |
| Operating Temperature | -20°C ~ 55°C | -20°C ~ 55°C |
| Must Operate Voltage | 16.8 VDC | 16.8 VDC |
| Must Release Voltage | 1.2 VDC | 1.2 VDC |
| Coil Current | 7.5 mA | 4.6 mA |
| Coil Resistance | 3.2 kOhms | 5.2 kOhms |
| RoHS Status | RoHS Compliant | ROHS3 Compliant |
| Packaging | - | Bulk |
Engineering Selection Recommendations
The RT3SN-24V is the direct substitute for the obsolete RT3S-24V. Both relays are members of the Panasonic RT-3 series and share identical electrical specifications for coil voltage, contact configuration, current rating, and switching voltage. The RT3SN-24V is currently in active production status, ensuring availability for replacement applications.
The RT3SN-24V demonstrates improved coil efficiency with reduced coil current (4.6 mA versus 7.5 mA) and higher coil resistance (5.2 kOhms versus 3.2 kOhms), resulting in lower power consumption while maintaining identical operational voltage thresholds. Both units are RoHS compliant, with the RT3SN-24V meeting ROHS3 specifications. The RT3SN-24V is available in bulk packaging and maintains full mechanical and electrical compatibility with existing installations designed for the RT3S-24V.
Frequently Asked Questions (FAQ)
Q: Can the RT3SN-24V directly replace the RT3S-24V without circuit modifications?
A: Yes. The RT3SN-24V maintains identical coil voltage (24VDC), contact configuration (SPST-NO x 4), current rating (3A), switching voltage (250VAC/30VDC), mounting type (DIN rail), and termination style (screw terminal). No circuit modifications are required.
Q: What is the difference in coil current between these relays?
A: The RT3S-24V draws 7.5 mA coil current, while the RT3SN-24V draws 4.6 mA. This reduction reflects improved coil design in the active RT3SN-24V model. Both operate at identical voltage thresholds (16.8 VDC must-operate, 1.2 VDC must-release).
Q: Are both relays suitable for the same operating temperature range?
A: Yes. Both the RT3S-24V and RT3SN-24V operate across -20°C to 55°C, ensuring compatibility in equivalent environmental conditions.
Q: What is the significance of the higher coil resistance in the RT3SN-24V?
A: The RT3SN-24V coil resistance of 5.2 kOhms (compared to 3.2 kOhms in the RT3S-24V) results in lower power dissipation and reduced heat generation during operation, while maintaining the same functional performance.
Q: Are there packaging differences between these relays?
A: The RT3S-24V packaging specification is not provided. The RT3SN-24V is available in bulk packaging. Confirm packaging requirements with your procurement specifications.
Q: What is the compliance status of each relay?
A: The RT3S-24V is RoHS Compliant. The RT3SN-24V is ROHS3 Compliant, meeting current regulatory standards for hazardous substance restrictions.
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