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Clause 3 – How to understand the definition of “protective device”
Bygezhi-tech January 27, 2025October 5, 2025

protective device: device, the operation of which prevents a hazardous situation under abnormal operation conditions The standard emphasizes “abnormal operation” here. Only devices that operate under “abnormal operation” conditions can be defined as protective devices. Therefore, there are many types of protective devices, including overheating protection devices, overcurrent protection devices, and overpressure protection devices. Overheating…

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Clause 3 – How to understand the definition of “non-self-resetting thermal cut-out”
Bygezhi-tech January 10, 2025September 27, 2025

non-self-resetting-thermal cut-out: thermal cut-out that requires a manual operation for resetting, or replacement of a part, in order to restore the current.NOTE Manual operation includes disconnection of the appliance from the supply mains. The thermal cut-out is equipped with a temperature-sensitive component, typically a bimetallic strip or a thermistor, which reacts to heat. As the…

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Clause 3 – How to understand the definition of “thermal link”
Bygezhi-tech December 30, 2024October 3, 2025

thermal link: thermal cut-out which operates only once and requires partial or complete replacement It is a temperature sensing device, but it can only be operated once, when the temperature is higher than its set value, it will disconnect, and after disconnection, the current can not pass through, so as to play the role of…

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Clause 3 – How to understand the definition of “self-resetting thermal cut-out”
Bygezhi-tech December 23, 2024September 27, 2025

self-resetting thermal cut-out: thermal cut-out that automatically restores the current after the relevant part of the appliance has cooled down sufficiently In the definition there is a clear mention, when the temperature is cooled to a certain degree, in fact, its intention is to control the temperature is not too high, when the temperature is…

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Clause 3 – How to understand the definition of “thermal cut-out”
Bygezhi-tech December 23, 2024September 27, 2025

thermal-cut-out: device which during abnormal operation limits the temperature of the controlled part by automatically opening the circuit, or by reducing the current, and is constructed so that its setting cannot be altered by the user. There are three key provisions here. First, the thermal cut-out is a heat-sensing element, second, it can only be…

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Clause 3 – How to understand the definition of “temperature limiter”
Bygezhi-tech December 23, 2024September 27, 2025

temperature limiter: temperature-sensing device, the operating temperature of which may be either fixed or adjustable and which during normal operation operates by opening or closing a circuit when the temperature of the controlled part reaches a pre-determined value.Note 1 to entry: A temperature limiter does not make the reverse operation during the normal duty cycle…

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Clause 3 – How to understand the definition of “thermostat”
Bygezhi-tech December 22, 2024September 27, 2025

thermostat: temperature-sensing device, the operating temperature of which may be either fixed or adjustable and which during normal operation keeps the temperature of the controlled part between certain limits by automatically opening and closing a circuit. The thermostat itself does not control the temperature, the thermostat senses the temperature and controls the temperature by switching…

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Clause 3 – How to understand the definition of “detachable power supply part”
Bygezhi-tech December 21, 2024September 27, 2025

detachable power supply part: part of the appliance the output of which is intended to be detachable from the class III construction part of the appliance.Note 1 to entry: Means of detachment are a flexible cord and connector or an appliance outlet fitted to the detachable power supply part. This actually defines a detachable adapter….

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Clause 3 – How to understand the definition of “battery-operated appliance”
Bygezhi-tech December 21, 2024September 27, 2025

(IEC 60335-1 Ed. 5.1) battery-operated appliance: appliance deriving its energy from batteries enabling the appliance to perform its intended function without a mains connection.(IEC 60335-1 Ed. 6)battery-operated appliance: appliance deriving its energy from batteries enabling the appliance to perform its intended function without a supply connectionNote 1 to entry: A battery-operated appliance can have a…

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