What do the letters mean on a circuit breaker?

The second letter stands for its interruption rating, or how many amperes it can take before it trips. A means Standard Rating, C stands for Extra High Rating, H is High Rating, and I is for Current Limiting Rating. The third letter shows the type of lug a breaker has.

What does W h mean on circuit breaker?

WH on a breaker would signify power to an ELECTRIC element for a water heater, though the unit may also use propane, or BOTH, if you have both switches on…mine does.

What does R mean on electrical panel?

The “R-Handles” indicates the second handle circuit of an old style tandem breaker which was constructed with the handle throws above and below each other. These would then be on the left and right as the breaker was installed in the panel.

What does Ahu stand for?

An Air Handling Unit (AHU) is used to re-condition and circulate air as part of a heating, ventilating and air-conditioning system.

Do AC units have breakers?

Your air conditioning unit has two breakers; one operates the outside unit while the other operates the inside. If the breakers appear tripped, turn the breakers off and then back on to reset them.

What is DC circuit breaker?

A DC circuit breaker is an OCPD that protects electrical devices operating with DC and contains additional arc-extinguishing measures. DC circuit breakers are a relatively new technology to most homeowners since most devices used in a house work with AC and AC circuit breakers.

What does Ah stand for in electrical panel?

But I already have A/C master on another circuit breaker switch, which means air conditioner to me. I am remarking my panels because the original writing is fading. Dave’s Reply: Thanks for your electrical question Vince. Vince, the A/H designation should indicate Air Handler, just as you mentioned.

What does the term ahu mean?

Definition: What Does the Term AHU Mean? This term is frequently used to describe a mechanical device that supplies air circulation for heating and cooling. This piece of equipment, handles the air with a fan that moves air into the ductwork and accepts return air from the conditioned spaces.

Who was Ihaia Te Ahu?

When Chapman established the first CMS mission station at Rotorua in 1835, Te Ahu was one of his assistants. Within a few years he married Rangirauaka, of Ngati Riripo. On 9 May 1841 Te Ahu was baptised by A. N. Brown, the CMS missionary at Tauranga, and took the name Ihaia (Isaiah).

What does 4040°C mean on a circuit breaker?

40°C – This marking indicates the maximum ambient temperature in which the circuit breaker can be applied at its marked ampere rating without rerating the ampacity of the circuit breaker.

What does HACR mean on a circuit breaker?

HACR type – This marking indicates the circuit breaker is suitable for use with the group motor installations typically found in heating, air conditioning and refrigeration equipment. The NEC 2005 no longer has this marking requirement.