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HomeProductsConnectors, InterconnectsTerminal Blocks - Barrier BlocksT37058-12-0
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T37058-12-0 - Curtis Industries

Manufacturer Part Number
T37058-12-0
Manufacturer
Curtis Industries
Allelco Part Number
98D-T37058-12-0
Warranty
1 Year Allelco Warranty - Find out more
Stock Status:
47,738 pcs available, New & Original
Parts Description
CONN BARRIER STRP 12CIRC 0.375"
Package
Bulk
Data sheet
T37058-12-0.pdf

Environmental Information

Curtis Industries REACH.pdf
RoHs Status
ROHS3 Compliant
Compare
Our certification
In stock: 47738
  • Unit Price: $9.116
  • Subtotal: $0.00

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Quantity Unit Price Ext. Price
1+ $9.116 $9.12
The above prices does not include taxes and freight rates, which will be calculated on the order pages.

Specifications

T37058-12-0 Tech Specifications
Curtis Industries - T37058-12-0 technical specifications, attributes, parameters and parts with similar specifications to Curtis Industries - T37058-12-0

Product Attribute Attribute Value
Manufacturer Curtis Industries
Wire Gauge 12-22 AWG
Voltage Rating 300V
Top Termination Screws with Captive Plate
Terminal Screw Material -
Terminal Screw Finish -
Terminal Block Type Barrier Block
Series 37000
Pitch 0.375' (9.53mm)
Package Bulk
Operating Temperature 105°C
Number of Wire Entries 12
Product Attribute Attribute Value
Number of Rows 1
Number of Circuits 12
Mounting Type Chassis, Panel; Through Hole
Material Flammability Rating UL94 V-0
Material - Insulation Polypropylene (PP)
Features Flange
Current Rating (Amps) 20A
Color -
Bottom Termination Quick Connect (0.250')
Base Product Number T37058
Barrier Type 3 Wall (Tri)

Environmental & Export Classifications

ATTRIBUTE DESCRIPTION
RoHs Status ROHS3 Compliant
Moisture Sensitivity Level (MSL) 1 (Unlimited)
REACH Status REACH Unaffected
ECCN EAR99
HTSUS 8536.90.4000

Frequently Asked Questions(FAQ)

What wire gauge range does the T37058-12-0 terminal block support, and how does this affect my design choices for industrial control panels?
The T37058-12-0 accepts 12–22 AWG wire, which spans a typical range from 2.08 mm² to 0.32 mm² cross-sectional area. This range accommodates both higher-current primary circuits (12 AWG copper at 20A continuous) and lower-current control signal lines (22 AWG). The T37058-12-0's screw termination with captive plate ensures consistent contact pressure across this range without re-adjustment during thermal cycling, reducing intermittent connection risks common in panel-mounted applications experiencing temperature swings between ambient and 105°C operating conditions.
Does the T37058-12-0 barrier block provide adequate isolation for mixed-voltage circuit routing in a single panel connector?
The T37058-12-0 employs a 3-wall (tri-wall) barrier design rated to 300V, which physically separates each of the 12 circuits in the barrier block. This tri-wall configuration means that three insulation boundaries surround signal paths, reducing cross-talk and providing galvanic isolation appropriate for applications combining low-level analog signals and switched AC/DC power on the same panel. The 300V rating of the T37058-12-0 supports routing of 240V industrial AC lines alongside 24V DC control circuits without exceeding the dielectric margin, though final isolation adequacy depends on circuit layout and creepage/clearance compliance with your target safety standard (IEC 61010, UL 508, or equivalent).
How does the 0.375" (9.53 mm) pitch of the T37058-12-0 compare to alternative barrier block pitch options, and what are the practical space trade-offs?
The T37058-12-0 with 0.375" pitch occupies approximately 4.5 inches of horizontal panel space for all 12 circuits (12 positions × 0.375"), making it suitable for standard DIN-rail or panel-mount applications where real estate is moderate. Finer-pitch options (0.200") reduce footprint by ~50% but typically limit current rating and wire gauge flexibility; coarser pitch (0.500" or larger) increases panel depth. The T37058-12-0's 0.375" pitch represents an engineering balance—wire entry, screw access, and thermal dissipation remain practical without requiring precision panel drilling or specialized tools, while the 12-circuit density accommodates most single-phase motor starters, solenoid arrays, and multi-input sensor harnesses.
What is the mechanical difference between the T37058-12-0's captive-plate screw design and traditional screwless quick-connect terminals, and which is better for field service environments?
The T37058-12-0 uses screws with a captive plate that retains the fastener, preventing loss during disassembly and ensuring repeatable clamping force (typically 8–12 in-lbs for 12 AWG). This design requires a screwdriver and adds ~15–30 seconds per wire connection but produces a visible, audible click when fully seated, enabling field technicians to verify termination quality without instrumentation. Screwless quick-connect systems (such as push-in or lever designs) sacrifice re-torque verification and are more prone to vibration-induced loosening in mobile or industrial environments. The T37058-12-0's captive-screw approach is preferred in applications with infrequent reconnection and critical uptime (factory automation, utility metering, emergency lighting panels) where field-serviceable repeatability outweighs speed.
Is the T37058-12-0 rated for direct connection to 20A branch circuit protection, or must I derate for thermal considerations in a sealed panel enclosure?
The T37058-12-0 is rated 20A per circuit at 105°C ambient, matching standard North American branch circuit protection (20A breaker or fused disconnect). However, when all 12 circuits on the T37058-12-0 are simultaneously loaded to 20A in a sealed NEMA 4X or IP67 enclosure without forced air, junction temperature can rise 15–25°C above the ambient rating due to I²R heating and reduced convection. Field practice often applies a 0.8–0.9 derating factor (16–18A per circuit of the T37058-12-0) when more than six circuits are active and ambient inside the enclosure exceeds 40°C, verified by thermal simulation or empirical panel testing. Consult the terminal block mounting location thermal model and Curtis Industries' application notes for your specific enclosure volume and duty cycle.
What does UL94 V-0 rating mean for the T37058-12-0's polypropylene housing, and does it affect fire risk in a high-temperature industrial application?
UL94 V-0 classification for the T37058-12-0's polypropylene insulation means the housing is self-extinguishing within 10 seconds after flame removal in a vertical burn test; no flaming drips are permitted. This material certification addresses enclosure fire safety but does not imply the T37058-12-0 can be exposed to continuous 105°C on the housing exterior—polypropylene begins stress-relaxation and dimensional creep above ~100°C under sustained load. In applications where the T37058-12-0 will mount directly adjacent to 105°C heat sources (motor terminals, power resistors), use thermal barriers, forced-air cooling, or derating to maintain housing temperature below 80°C to preserve screw clamping force and barrier insulation integrity. V-0 rating protects against arc-fault propagation; it does not substitute for thermal management design.
How should I specify the T37058-12-0 in a legacy industrial control retrofit where the original panel used 0.250" quick-connect under-barrier termination?
The T37058-12-0 provides 0.250" quick-connect (QC) termination on the bottom, allowing direct connection to existing 0.250" QC bus bars, relay contacts, and PLC output modules without rewiring the sub-panel infrastructure. This backwards compatibility is a primary reason the T37058-12-0 remains common in retrofit work: the top face accepts screw-down field wiring (12–22 AWG), while the bottom integrates with legacy 0.250" QC distribution buses already installed. When retrofitting, verify that existing bus bars are rated for the T37058-12-0's 20A per position and 300V insulation; older buses may be derated. The T37058-12-0's dual-termination architecture eliminates the need to replace the entire sub-panel harness, reducing labor and downtime.
Can the T37058-12-0 be safely used in an outdoor or damp marine environment, or does moisture ingress into the polypropylene barriers compromise dielectric strength?
The T37058-12-0 carries MSL 1 (Unlimited moisture sensitivity), indicating polypropylene is inherently moisture-resistant and does not swell, delaminate, or lose mechanical strength upon exposure to humidity or salt spray in the short term. However, MSL 1 applies to assembly and storage, not field deployment; polypropylene's dielectric constant increases ~2–3% at 95% RH, slightly reducing breakdown voltage margins. For outdoor or marine use, the T37058-12-0 requires an environmental backshell or potted strain relief to prevent capillary moisture ingress along wire insulation into the screw chambers, and the mounting flange should be sealed with silicone or polyurethane to block water migration into the barrier block cavity. NEMA 6P or IP69K-rated enclosures are recommended; bare T37058-12-0 exposure to salt fog will corrode exposed screw hardware within 2–5 years and degrade polypropylene surface gloss, though electrical function may persist longer.
What is the practical current-carrying capacity of a single 22 AWG wire terminated on the T37058-12-0, and does the 20A per-circuit rating apply to fine-gauge control signals?
Individual 22 AWG copper wire has continuous ampacity of ~7–8A in free air per the National Electrical Code, well below the T37058-12-0's per-circuit rating of 20A. The T37058-12-0's 20A specification represents the terminal block's mechanical and thermal limit when installed with 12 AWG primary conductors; using 22 AWG on the T37058-12-0 for 15A+ circuits creates a bottleneck—the wire will overheat before the terminal block reaches its thermal limit. Practical guidance: the T37058-12-0 with 22 AWG should be derated to ~5A continuous per circuit for control signal and low-current pilot duty. For higher-current branches (10A+), use 14–16 AWG on the T37058-12-0 to ensure wire and terminal ampacity match, preventing thermal runaway at the wire-screw interface.
Does the T37058-12-0's flange-mount design allow daisy-chaining multiple barrier blocks, or is each barrier block independent with separate wire entries?
The T37058-12-0 is a single, independent 12-circuit barrier block with one integral flange for panel or chassis mounting; each T37058-12-0 has its own set of 12 wire entry points and does not physically daisy-chain to adjacent blocks. Expanding a panel to 24, 36, or more circuits requires installing multiple T37058-12-0 units side-by-side, each with separate screw terminals and 0.250" QC connections to the sub-panel bus bar. However, the modular design of the T37058-12-0 simplifies scaling: additional blocks can be added by simply bolting more flanges to the panel and connecting them in parallel to the same bus bar, without rewiring the existing T37058-12-0 installation. This modularity is advantageous for phased automation upgrades where future circuit count is uncertain.
How does the T37058-12-0's ROHS3 compliance affect long-term material compatibility with lead-free solder on the quick-connect terminals?
The T37058-12-0 is ROHS3-compliant, meaning its materials (polypropylene, tin-plated copper terminals, steel screws) do not contain restricted substances such as lead, cadmium, or hexavalent chromium. The 0.250" QC terminals on the underside of the T37058-12-0 are tin-plated to accept lead-free solder (SAC305 or equivalent) used on modern PLC relay output modules and sub-panel interconnects. Tin plating is compatible with lead-free solder and does not form brittle intermetallic layers over the service life of the terminal block; however, thermal cycling (–10°C to +105°C) can induce whisker growth in pure tin coatings over 10+ years. Applying a thin nickel underplate beneath the tin on the T37058-12-0's QC terminals (a cost-optimization in newer Curtis Industries batches) mitigates whisker risk. Verify with your distributor or Curtis Industries whether your T37058-12-0 lot includes nickel-underplated terminals if the application involves high-reliability aerospace or medical equipment.
What torque specification should I use when tightening the captive screws on the T37058-12-0, and what happens if I over-torque?
Curtis Industries typically specifies 8–12 in-lbs (0.9–1.4 N·m) for barrier block terminal screws on the T37058-12-0 when terminating 12–16 AWG conductors; finer gauges (18–22 AWG) should be torqued toward the lower end (6–8 in-lbs) to avoid crushing insulation. Over-torquing the T37058-12-0 captive screws above 15 in-lbs can crack the polypropylene barrier walls, creating internal fissures that propagate under thermal stress and reduce dielectric strength by 10–20%, particularly near 105°C. Under-torquing below 6 in-lbs leaves inconsistent contact pressure, risking millivolt-level voltage drops and arcing during high-inrush transients. Use a calibrated torque screwdriver (not an impact driver) when terminating high-current circuits on the T37058-12-0; a hand screwdriver with gentle resistance indicates proper torque in field service when precise tools are unavailable.
Can the T37058-12-0 be used in a UPS (uninterruptible power supply) battery disconnect application where 48V DC and 120V AC coexist on adjacent circuits?
Yes, the T37058-12-0's 300V rating and 3-wall barrier design accommodate mixed 48V DC and 120V AC on adjacent circuits within the same 12-circuit barrier block. The tri-wall barrier structure on the T37058-12-0 provides dielectric separation equivalent to creepage/clearance distances required by IEC 60950-1 (IT equipment safety) when spacing between live conductors of different voltages is verified. However, when terminating both DC and AC on a single T37058-12-0, ensure that the wire gauge and insulation rating of all conductors are rated for the higher voltage (120V AC equivalent or higher peak voltage); the T37058-12-0 does not internally manage voltage bias and relies on each wire's insulation for secondary protection. Additionally, confirm that your UPS control logic prevents simultaneous closure of both 48V and 120V circuits on the T37058-12-0 during transients, as the barrier block can isolate circuits but cannot prevent fault propagation if multiple circuits are activated simultaneously.

Parts with Similar Specifications

The three parts on the right have similar specifications to Curtis Industries T37058-12-0

Product Attribute T37058-11-0 T37058-14-0 T37058-17-0 T37058-19-0
Part Number T37058-11-0 T37058-14-0 T37058-17-0 T37058-19-0
Manufacturer Curtis Industries Curtis Industries Curtis Industries Curtis Industries
Terminal Screw Material - - - -
Bottom Termination - - - -
Terminal Block Type - - - -
Features - - - Simultaneous Sampling
Top Termination - - - -
Series - - - -
Package - Tape & Reel (TR) Tube Tape & Reel (TR)
Number of Wire Entries - - - -
Wire Gauge - - - -
Material - Insulation - - - -
Operating Temperature - -40°C ~ 85°C 0°C ~ 70°C -40°C ~ 85°C
Terminal Screw Finish - - - -
Pitch - - - -
Barrier Type - - - -
Material Flammability Rating - - - -
Number of Rows - - - -
Base Product Number - DAC34H84 MAX500 ADS62P42
Voltage Rating - - - -
Number of Circuits - - - -
Current Rating (Amps) - - - -
Color - - - -
Mounting Type - Surface Mount Through Hole Surface Mount

T37058-12-0 Datasheet PDF

Download T37058-12-0 pdf datasheets and Curtis Industries documentation for T37058-12-0 - Curtis Industries.

HTML Datasheet
Cylindrical Battery Holders.pdf
Environmental Information
Curtis Industries REACH.pdf

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Curtis Industries

T37058-12-0

Curtis Industries
98D-T37058-12-0

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