Description
EMERSON NETWORK POWER
ASCO 350 SERIES
TRANSIENT VOLTAGE SURGE SUPPRESSION DEVICE
350277YQ50
VOLTAGE: 277/480V 3 PHASE WYE, 4W+G, 50/60 HZ
VPR: 2000VPK (L-N,L-G,N-G), 4000VPK(L-L)
MCOV: 320V (L-N,L-G,N-G), 640V(L-L)
IN: 3KA
TYPE 2 SPD UL MODEL IL277YQ50
The Emerson ASCO 350 Series 350277YQ50 is a Transient Voltage Surge Suppression (TVSS) device designed to protect sensitive electrical and electronic equipment from damaging voltage transients. Rated for 277/480V three-phase Wye configurations (4W+G, 50/60 Hz), this Type 2 Surge Protective Device (SPD) is deployed within PLC, HMI, and automation panel installations onboard vessels where power quality directly impacts control system reliability. Surge events caused by lightning, switching transients, or grid disturbances can cause irreversible damage to programmable controllers and human-machine interfaces — making robust surge suppression an essential layer of protection in any marine automation architecture.
Key Features
✓ Surge suppression function: Provides transient voltage clamping across all conductor combinations — Line-Neutral, Line-Ground, and Neutral-Ground — with voltage protection ratings of 2000VPK (L-N, L-G, N-G) and 4000VPK (L-L), limiting let-through voltage to protect downstream equipment.
✓ Confirmed electrical ratings: Rated for 277/480V 3-phase Wye (4W+G) at 50/60 Hz, with Maximum Continuous Operating Voltages (MCOV) of 320V (L-N, L-G, N-G) and 640V (L-L), and a nominal discharge current (In) of 3kA; UL listed as model IL277YQ50.
✓ System compatibility: Suited for integration into marine PLC and HMI control panels, automation cabinets, and power distribution boards operating on 277/480V Wye distribution systems, subject to confirmation against the specific panel configuration.
✓ Installation context: Intended for Type 2 service entrance or distribution panel mounting; suitable for installation in enclosed electrical rooms, switchboard spaces, or automation cabinets — final suitability for specific vessel environments subject to confirmation.
✓ Replacement & retrofit: A direct replacement for existing ASCO 350 Series units in 277/480V Wye applications; compatibility with the host panel or system should be confirmed against nameplate data and installation drawings prior to fitment.
Marine Applications
✓ Protection of PLC and HMI control systems within vessel automation and machinery monitoring installations exposed to shipboard power quality issues.
✓ Surge protection for navigation, communication, and bridge equipment distribution boards on commercial and offshore vessels.
✓ Integration into engine room automation panels, propulsion control systems, and auxiliary machinery control cabinets where transient events pose operational risk.
✓ Deployment on offshore platforms, FPSOs, and drilling units where electrical infrastructure is subject to frequent switching transients and lightning exposure.
✓ Retrofit installation in aging vessel automation systems requiring upgraded surge protection to meet current operational and safety standards.
Why Marine Engineers Choose
The ASCO 350 Series is a well-established surge protection platform from Emerson Network Power, offering clearly defined voltage protection ratings and UL listing — giving marine electrical engineers confidence in specifying a surge protective device that meets defined performance parameters for 277/480V Wye distribution systems in demanding shipboard environments.
Ideal For
Commercial cargo vessels, tankers, offshore support vessels, FPSOs, drilling units, cruise ships, and any vessel or platform operating 277/480V three-phase Wye electrical systems with PLC, HMI, or sensitive automation equipment requiring transient voltage protection.
Technical Support & Compliance
Remote technical support is available to assist with installation guidance, panel integration queries, and compatibility checks for this surge protective device. Pre-installation review, commissioning support, and retrofit assessment services can be arranged subject to confirmation. To confirm suitability for your application, buyers are encouraged to share nameplate photographs, the host panel model and drawings, existing SPD part numbers being replaced, distribution system configuration details, and vessel name or IMO number where relevant. All compatibility and installation assessments are subject to confirmation based on documentation provided.
