Description

The Panasonic CM1a-R-12V is a sealed automotive power relay with a plug-in terminal type and an internal resistor. It is designed for use in automotive applications where reliable switching of high currents is required. The relay features a compact size and a robust construction suitable for harsh environments.

Features

• Protective Construction: Sealed to protect against dust and moisture.
• Terminal Type: Plug-in type for easy installation.
• Protective Element: Equipped with an internal resistor.
• Rated Coil Voltage: 12V DC.
• Contact Arrangement: 1 Form A (SPST-NO, single-pole single-throw normally open).
• Operating Function: Single side stable.
• Operate (Set) Voltage: 3 to 7V DC (initial, at 20°C).
• Release (Reset) Voltage: 1.2 to 4.2V DC (initial, at 20°C).
• Rated Operating Current: 143 mA (at 20°C).
• Coil Resistance: 96Ω (at 20°C).
• Rated Operating Power: 1.71 W (at 20°C).
• Usable Voltage Range: 10 to 16V DC.
• Contact Resistance: Max. 15mΩ (typical 2mΩ, measured at 1A 6V DC).
• Contact Material: Silver alloy (Ag alloy).
• Nominal Switching Capacity: 35A at 14V DC (resistive load).
• Max. Carrying Current: 20A at 14V DC (continuous, at 85°C).
• Min. Switching Load: 1A at 14V DC (at 20°C).
• Contact Voltage Drop: Max. 0.5V (after electrical life test, at 35A 14V DC).
• Insulation Resistance: Min. 20 MΩ (measured at 500V DC).
• Dielectric Strength: 500 Vrms for 1 minute (between open contacts and between contacts and coil).
• Operate (Set) Time: Max. 10ms (at rated coil voltage, at 20°C, without contact bounce time).
• Release (Reset) Time: Max. 10ms (at rated coil voltage, at 20°C, without contact bounce time, without diode).
• Shock Resistance: Functional: Min. 200 m/s² (approx. 20G); Destructive: Min. 1,000 m/s² (approx. 100G).
• Vibration Resistance: Functional: 10 to 500 Hz, Min. 44.1 m/s² (approx. 4.5G); Destructive: 10 to 2,000 Hz, Min. 44.1 m/s² (approx. 4.5G), 4 hours per direction (X, Y, Z).
• Expected Life: Mechanical: Min. 10⁶ cycles (at 120 cpm); Electrical: Min. 10⁴ cycles (2s ON, 2s OFF).
• Ambient Conditions: Temperature: –40 to +85°C; Humidity: 5 to 85% R.H. (avoid icing or condensation).
• Weight: Approx. 20 g.

Types

The CM1a-R-12V is part of the CM series of automotive relays. Variants may differ in terms of contact form, voltage, and other specifications, but the CM1a-R-12V specifically features a 12V DC coil voltage and a single-pole single-throw normally open (SPST-NO) contact arrangement.

Applications

• Automotive Systems: Suitable for applications such as fan motors, heaters, head lamps, air compressors, and EPS (Electric Power Steering) systems.
• Industrial Equipment: Can be used in various industrial applications requiring reliable switching of high currents.
• Battery-Equipped Devices: Ideal for use in battery-operated equipment where space and weight are critical factors.