Compatibility Chart

Transformer Load - H277 (300VA)
1. H277 Transformer at full loading consumes a maximum of 16W of power.
2. When a dimmer or switch is on the secondary (120V) side of the transformer, power is
consumed by the transformer when the dimmer or switch is in “OFF” mode at 6.5W and in
“ON” mode at 16W maximum under full loading.
3. When a dimmer or switch is on the primary (277V) side ahead of the transformer, power is
consumed only in “ON” mode to a maximum of 16W under full loading.
(Use of a dimmer ahead of the transformer is not recommended)
Transformer Load - H347 (75VA)
1. H347 Transformer at full loading consumes a maximum of 15W of power.
2. When a dimmer or switch is on the secondary (120V) side of the transformer, power is
consumed by the transformer when the dimmer or switch is in “OFF” mode at 2.5W and in
“ON” mode at 15W maximum under full loading.
3. When a switch is on the primary (347V) side ahead of the transformer, power is consumed
only in “ON” mode to a maximum of 15W under full loading.
(Use of a dimmer ahead of the transformer is not recommended)
Transformer Load - H347200 (200VA)
1. H347200 Transformer at full loading on 120V side consumes a maximum of 28W of power.
2. When a dimmer or switch is on the secondary (120V) side of the transformer, power is
consumed by the transformer when the dimmer or switch is in “OFF” mode at 9.2W and in
“ON” mode at 28W maximum under full loading.
3. When a switch is on the primary (347V) side ahead of the transformer, power is consumed
only in “ON” mode to a maximum of 28W under full loading.
When a switch is on the primary (277V) side ahead of the transformer, power is consumed
only in “ON” mode to a maximum of 12W under full loading.
(Use of a dimmer ahead of the transformer is not recommended)
Step Down Transformers
H277 = Steps 277 line voltage down to 120 volts. Attaches to knockout on first fixture’s junction
box in a circuit and is 300VA rated. H277 is a UL recognized Component listed under the luminaire
UL/cUL listing for Halo Non-IC housings.
H347 and H347200 = Steps 347 line voltage down to 120 volts. Attaches to knockout on first
fixture’s junction box in a circuit. H347 is 75VA and H347200 is 200VA rated. H347 is a CSA/UL
Listed Component for use under the luminaire UL/cUL listing with Halo Non-IC housings.
H347
347V Step Down Transformer,
75VA
2-7/8
2-1/2”
[63mm]
2-3/4”
[70mm]
H347
H347200
347V Step Down Transformer,
200VA
2-7/8
2-3/16”
[56mm]
4-3/4”
[121mm]
H347200
H277
277V Step Down Transformer,
300VA
2-7/8
2-3/16”
[56mm]
4-3/16”
[106mm]
H277
Application Note - H277, H347 and H347200 step-down transformers are qualified to drive
multiple Halo LED on a single circuit in Non-IC construction. Installation of these transformers
with individual LED fixtures on circuits with multiple LED loads is not recommended. This is
not recommended due to resulting multiple inductive currents pulled by each transformer; in
this situation the majority of the power would then be reactive (VARS) and not real (WATTS). If
H277, H347 or H347200 transformers should be used individually on each LED fixture in a single
circuit, then that circuit should be sized for lowered power factor as well as increased apparent
power on the circuit. H277, H347 and H347200 are UL/cUL listed for use with Halo recessed
housings: H750T, H750TCP, H7T, H7TNB, H7RT.
HLB Retrofit LED Downlight Series
(HLB Maximum Units on Step Down Transformer Powered Circuits)
Max # of Fixtures
Transformer VA Rating 600 Series 900 Series
H277
300 24 16
H347
75 6 4
H347200
200 16 10
17
Eaton HLB Dimming Guide - PA518121EN