Standard 1-300 Watt DC/DC converters for surface, through-hole or chassis assembly. High reliability for industrial, commercial, communications, transportation and medical applications. Semi-customized versions up to 22'000 Watt upon request. Standard AC/DC power supplies for industrial, commercial, residential and medical grade applications, offered in encapsulated modules, open board, metal casing, under wall and NEMA 4X Die cast housing form factors. Standard DIN-rail power supplies for Industrial, domotive, commercial and communications applications, from 15 Watt up to 960 Watt, worldwide safety approvals, hazloc models with limited power or ATEX certification. Wide range of medical grade AC/DC power supplies and DC/DC-converters. They provide a reinforced insulation system rated for means of operator protection (2x MOOP) or means of patient protection (2x MOPP) in accordance to latest medical standards: IEC/EN 60601-1 3rd edition and ANSI/AAMI ES... DC/DC converters that meet the stringent requirements for mobile and stationary railway applications in accordance to EN50155.

They provide increased EMC immunity against surge, burst, radiated and conducted disturbances. how many ac window units do i needThe input voltage ranges cover the nominal 24, 36, 72 and 110 VDC with ±40 %...through the wall air conditioner brandsThe DC power supply in EX4300 switches is abest floor ac unit hot-insertable and hot-removable field-replaceable unit (FRU): You can install it without powering off the switch or disrupting the switchingAll the EX4300 switches that are powered by DC power supplies except EX4300-24T-S, EX4300-24P-S, EX4300-32F-S, EX4300-48T-S, and EX4300-48P-S switches are shipped with one DC power supply pre-installed in the rear panel of the switches. EX4300-48T-S, and EX4300-48P-S switches are not shipped with pre-installed

you must order them separately.This topic describes the DC power supplies. Do not mix:AC and DC power supplies in the same chassisPower supplies with different airflow labels ( and ) inFan modules with different airflow labels ( and ) in thePower supplies and fan modules with different airflow labels ( and ) in the same chassis.This topic includes:Characteristics of a DC Power SupplyDC Power Supply AirflowN+0 Redundancy Configuration of DC Power SuppliesN+N Redundancy Configuration of DC Power SuppliesEX4300 switches support 550 W DC power supply (see Figure 1). The DC power supplies support Power over Ethernet (PoE+) in EX4300-24P, EX4300-24P-S, EX4300-48P,Figure 1: DC Power Supply for an EX4300 SwitchYou can install up to two DC power supplies in an EX4300 switch. Power supplies are installed in the power supply slots labeled PSU 0 and PSU 1 in the rear panel of the chassis. Table 1 lists the details of the 550 W DC power supplies used in EX4300 switches.

Table 1: Details of the DC Power Supplies in EX4300 SwitchesDetails550 W DC Power SupplyModel numberJPSU-550-DC-AFO-AJPSU-550-DC-AFI-AField-replaceable unit (FRU) type Hot-insertable and hot-removablePower supply weight2.43 lb (1.1 kg)Minimum installed in chassis1Maximum installed in chassis2Power supply slotsInstall in power supply slots labeled PSU 0 and PSU 1 in the rear panel of the chassis.FansInternalAirflowFront-to-back, indicated by label Back-to-front, indicated by label Power supply status LEDsIN OK and OUT OKDC input current rating4 AOperating range–38 through –60 VDCNote: The minimum input power required to power on the switch is –43.5 +/– 0.5 VDC. After the switch is powered on, the operating range is –38 throughTo prevent electrical injury while installing or removing DC power supplies, carefully follow instructions in Installing a DC Power Supply in an EX4300 Switch and Removing a DC Power Supply from an EX4300 Switch.Each power supply has its own fan and is cooled by its own internal

Each power supply has a label AIR OUT (AFO) or AIR IN (AFI) on the faceplate of the power supply that indicates the direction of airflow in the power supply.Table 2 lists the DC power supply models and the direction of airflow in them.Table 2: Airflow Direction in DC Power Supply Models for EX4300 SwitchesModelLabel on Power SupplyDirection of AirflowJPSU-550-DC-AFO-AAIR OUT (AFO)Front-to-back—that is, air intake to cool the chassis is through the vents on the front panel of the chassis and hot air exhausts through the vents on the rear panel of the chassis.JPSU-550-DC-AFI-AAIR IN (AFI)Back-to-front—that is, air intake to cool the chassis is through the vents on the rear panel of the chassis and hot air exhausts through the vents on the front panel of the chassis. In an N+0 redundancy configuration, no power is reserved for resiliency regardless of number of power supplies installed in the switch.Depending on the power supplies installed in the switch, you

can determine the system power budget.If one power supply is installed in the switch: System power budget = Output wattage of the installed power supply (PSU(W))If two power supplies are installed in the switch:System power budget = (Sum of the output wattage of the two power supplies) – (10% of the output wattage of the installed power supply)System power budget = PSU0(W) + PSU1(W) – (0.10 x (PSU(W))Table 3 lists the N+0 power calculation for EX4300 switches that use 550 WTable 3: N+0 DC Power Calculations for EX4300 Switch ConfigurationsSwitch ConfigurationNumber of Power SuppliesTotal Power (in watts)System Power Budget (in watts)Backup Power (in watts)Base Power (in watts)Available PoE Power (in watts)Ports Enabled for PoE+24-port EX4300 switch155055001504001321100104501508952432-port EX4300 switch15505500149N/AN/A21100550550160N/AN/A48-port EX4300 switch1550550017537512211001045017587029You can configure your switch for N+N redundancy, in which N power supplies

can be removed or fail and the remaining N power supplies continue to supply power for the switch without interruption.You can configure the power management software to manage switch power for N+N redundancy. When you configure power management for N+N redundancy, half of the total power available (N) is held as reserve power while the other half (N) is available for immediate consumption. configuration changes and requires additional power, then additional power is drawn from the reserve power, and the switch no longer has N+N power supply redundancy. condition raises a minor alarm. If the condition is not corrected within 5 minutes, then a major alarm is issued.For more information about how power management allocates power to chassis components when power is insufficient, see Understanding Power Management on EX Series Switches.Depending on the power supplies installed in the switch, youIf one power supply is installed in the switch:System power budget = Output wattage of the installed

power supply (PSU(W))Backup power available = 0 WA minor alarm is raised as switch has no N+N power supply redundancy.If two power supplies are installed in the switch:System power budget = (Output wattage of one power supply) – (5% of the output wattage of one power supply)System power budget = PSU(W) – (0.05 x PSU(W))Backup power available = (Output wattage of one power supply) – (5% of the output wattage of one power supply)System power budget = PSU(W) – (0.05 x PSU(W))Table 4 lists the N+N power calculation for EX4300 switches that use 550 W DC power supplies.Table 4: N+N DC Power Calculations for EX4300 Switch ConfigurationsSwitch ConfigurationNumber of Power SuppliesTotal Power (in watts)System Power Budget (in watts)Backup Power (in watts)Base Power (in watts)Available PoE Power (in watts)Ports Enabled for PoE+24-port EX4300 switch155055001504001321100522.5522.5150372.51232-port EX4300 switch15505500149N/AN/A21100550550160N/AN/A48-port EX4300 switch155055001753751221100522.5522.5175347.511Related DocumentationEX SeriesDC Power Supply LEDs in EX4300 SwitchesDC Power Supply Specifications for EX4300 SwitchesInstalling a DC Power Supply in an EX4300 Switch